Do In-Pool Lounge Chairs Need to Be Filled With Water? Water-Filled vs Sandbag-Weighted Designs

Quick Answer
No, not all in-pool lounge chairs need to be filled with water. Some designs use water inside a hollow chair body as ballast, while others use removable sandbags or a separate weighted base to help the chair remain stable on a shallow tanning ledge.

Water-filled chairs can work well when they remain in one place for most of the season. Sandbag-weighted chairs are often easier to move, reposition, and store because the weight can be removed separately from the chair.

The weighting system is only one part of stability. Water depth, ledge slope, water movement, chair geometry, and correct installation also affect how securely an in-pool chair stays in place.

Why Do In-Pool Lounge Chairs Need Extra Weight?

An in-pool lounge chair sits partly underwater while resting on a tanning ledge, sun shelf, or Baja shelf. If the chair has a hollow or lightweight structure, the water around it creates upward force.

That upward force becomes more noticeable when:

  • The water is deeper
  • The chair contains trapped air
  • The user gets out of the chair
  • A return jet or water feature creates movement
  • The pool water level rises
  • The chair has limited contact with the ledge

This is why purpose-built in-pool lounge chairs usually include some type of stabilization system. Depending on the product, that may involve water-filled chambers, removable sandbags, a weighted base, or the natural weight and shape of the chair.

However, adding weight does not make a lounge chair suitable for unlimited water depth. Every chair still has a recommended operating depth based on its design.

Extra weight helps an in-pool lounge chair resist buoyancy and water movement, but it cannot compensate for water that is deeper than the chair was designed to handle.

How Do Water-Filled In-Pool Lounge Chairs Work?

A water-filled lounge chair normally has one or more hollow internal chambers. These chambers are opened while the chair is positioned in the pool, allowing pool water to enter the chair body.

As water replaces the air inside the chair, the product becomes heavier and less likely to float.

A typical setup may involve:

  1. Carrying the empty chair onto the tanning ledge
  2. Opening the designated fill port
  3. Allowing pool water to enter the internal chamber
  4. Tilting or adjusting the chair to release trapped air
  5. Closing the fill port
  6. Moving the chair into its final position

The exact process varies by manufacturer, so owners should always follow the instructions supplied with the product.

Does the Entire Chair Need to Be Filled?

Not necessarily. Some products use one internal ballast chamber, while others use several fill points. A chair should only be filled through the openings identified by the manufacturer.

Drilling additional holes, removing unapproved plugs, or adding material to an internal chamber can damage the chair and affect its warranty.

What Happens When You Need to Move It?

Once filled, a water-ballasted chair can become significantly heavier than it was out of the box. That additional weight is useful while the chair is in position, but it can make seasonal handling more complicated.

Before moving or storing a water-filled chair, the owner may need to:

  • Open the drain or fill ports
  • Tilt the chair to release water
  • Wait for the internal chamber to empty
  • Repeat the process if water remains trapped
  • Allow the inside to drain before long-term storage

A chair should not be dragged across a plaster, pebble, tile, fiberglass, or vinyl surface simply because it is too heavy to lift.

How Do Sandbag-Weighted In-Pool Lounge Chairs Work?

A sandbag-weighted chair uses one or more removable weight bags instead of filling the main chair body with pool water.

The sandbags are placed in a designated compartment, support area, or position near the base of the lounge chair. The added weight helps improve contact between the chair and the tanning ledge while reducing floating and unwanted movement.

Unlike a water-filled design, the chair itself does not act as a large water tank.

Why Use Removable Sandbags?

A removable sandbag separates the chair’s structure from its ballast.

That creates several practical advantages:

  • The chair and its weight can be moved separately
  • The chair body does not need to be drained
  • Owners can inspect the weight bags independently
  • Seasonal storage can be more straightforward
  • A folding chair can be stored without a water-filled chamber
  • The chair may be easier to reposition before severe weather

The sandbags must still be installed correctly. A missing, underfilled, damaged, or incorrectly positioned bag may reduce the stability of the chair.

Water-Filled vs Sandbag-Weighted In-Pool Lounge Chairs

Neither system is automatically right for every pool. The better option depends on how often the furniture will be moved, where it will be stored, and how much setup the owner prefers.

Feature Water-Filled Design Sandbag-Weighted Design
Source of ballast Pool water inside the chair Removable bags filled with sand
Initial setup Fill chambers and release trapped air Fill and position the approved sandbags
Chair body drainage Usually required before storage Usually not required for ballast removal
Moving the chair May require draining first Weight can often be removed separately
Seasonal storage Drain and dry the internal chambers Remove bags, rinse the chair, and allow components to dry
Weight adjustment Determined by the internal chamber Determined by the approved number and fill level of bags
Internal standing water Possible if the chamber is not fully drained No large internal water chamber used for ballast
Best suited for Furniture that remains in one location Furniture that may be moved or stored more frequently
Main maintenance point Fill ports, plugs, drainage, and trapped water Bag condition, placement, and approved fill material

The table compares the general operating principles of the two systems. It does not mean that every sandbag-weighted chair is more stable than every water-filled chair.

Overall stability also depends on:

  • Chair shape and footprint
  • Contact area with the pool ledge
  • Total ballast
  • Water depth
  • Platform slope
  • Water circulation
  • Correct installation

Which Weighting System Is Easier to Set Up?

A water-filled chair may appear easier because the pool already provides the ballast. However, the chair must still be positioned correctly, filled through the approved openings, and cleared of trapped air.

If a chamber is only partly filled, the remaining air may continue to create buoyancy.

A sandbag-weighted chair usually requires more preparation before its first use. The bags may need to be filled with clean sand and secured according to the product instructions.

Once the sandbags have been prepared, they can normally be reused. The owner does not need to refill and drain the entire chair whenever it is moved.

Setup Comparison

Choose a water-filled design when:

  • The chair will stay on the ledge for most of the season
  • You are comfortable filling and draining the chair
  • The product has accessible, well-designed fill ports
  • You have enough space to tilt the chair during drainage

Choose a sandbag-weighted design when:

  • You expect to reposition the chair
  • You want the ballast to remain separate from the chair body
  • You remove furniture before storms or pool maintenance
  • You need easier seasonal storage
  • You are considering a portable or folding model

Which Design Is Easier to Move?

Sandbag-weighted chairs generally have an advantage when frequent movement is a priority because the owner can remove the ballast before lifting the product.

With a water-filled chair, movement may require draining the internal chamber first. Attempting to move a fully filled chair can place unnecessary stress on the product and the person lifting it.

Regardless of the design, follow these precautions:

  1. Remove or reduce the ballast according to the manufacturer’s instructions.
  2. Make sure nobody is sitting in the chair.
  3. Check underneath the chair for sand, stones, or other debris.
  4. Lift the chair rather than dragging it.
  5. Use two people for large or awkward models.
  6. Keep the route clear of steps and other furniture.

A folding pool lounge chair can be especially practical when furniture needs to be carried between the tanning ledge, pool deck, garage, or storage area. AquaCurve’s folding model arrives assembled, includes carrying handles, folds flat, and uses removable sandbags rather than a water-filled chair body.

Which Design Is Easier to Store?

Both systems require routine exterior cleaning. Pool water, sunscreen, tanning oil, mineral residue, leaves, and airborne dirt can collect on any in-pool furniture.

Use fresh water, a soft cloth, and mild soap when necessary. Avoid abrasive pads, harsh solvents, and cleaning methods that could damage the surface.

Maintenance for Water-Filled Chairs

Inspect:

  • Fill and drain ports
  • Plugs and caps
  • Seals around the openings
  • Internal drainage
  • Areas where water may remain trapped

The chair should be fully drained before winter storage or extended periods of nonuse.

Maintenance for Sandbag-Weighted Chairs

Inspect:

  • Bag seams
  • Closures
  • Handles or attachment points
  • Signs of leakage
  • Placement within the chair
  • Sand or debris around the bag compartment

Do not replace an approved sandbag with loose bricks, metal weights, stones, or sharp objects. These materials may damage the chair or pool surface.

Does One Design Stay in Place Better?

A weighting method alone does not determine stability.

A well-designed water-filled chair may remain stable in its intended environment, while an incorrectly filled chair may retain too much air. A properly installed sandbag-weighted chair may also perform well, but missing or incorrectly positioned bags can reduce its effectiveness.

The following conditions can affect either system:

Pool Condition Possible Effect
Water deeper than recommended Increased buoyancy and movement
Sloped or uneven ledge Chair may sit unevenly or shift
Return jet aimed at the chair Continuous water pressure may move it
Fountain or water feature nearby Increased turbulence
Higher-than-normal pool level More of the chair becomes submerged
Missing or insufficient ballast Reduced contact with the ledge
Flat ledge within the recommended depth Best intended operating condition

A chair that is stable in six inches of calm water may behave differently after heavy rain raises the pool level or when a return jet is aimed directly at its base.

Can You Add More Weight to Use the Chair in Deeper Water?

Only use weighting methods approved by the chair manufacturer.

Adding more ballast does not automatically make a lounge chair safe or suitable for deeper water. As the water level rises, a greater portion of the chair becomes submerged, increasing the upward force acting on it.

Unapproved weight can also:

  • Damage the chair
  • Place stress on its joints
  • Scratch the pool surface
  • Create sharp or unstable contact points
  • Make the chair unsafe to lift
  • Affect warranty eligibility

When a chair moves unexpectedly, check the following before adding weight:

  1. Measure the actual water depth at the chair’s position.
  2. Confirm that all supplied ballast is installed.
  3. Check whether the ledge is flat.
  4. Move the chair away from return jets or water features.
  5. Inspect the ballast for damage or incorrect placement.
  6. Review the manufacturer’s depth recommendation.

Do Water-Filled Chairs Contain Pool Water Permanently?

Usually, no. Water is used as temporary ballast while the chair is in position.

The chair should normally be drained before long-term storage, freezing weather, transportation, or any situation in which the product must be moved over a significant distance.

Owners should not assume that the internal water is sealed permanently unless the manufacturer specifically describes the product that way.

Are Sandbags Supposed to Stay in the Pool?

Sandbags designed for in-pool furniture may remain installed while the chair is being used, provided they are secured in the approved location and remain in good condition.

They should be inspected periodically for:

  • Loose closures
  • Worn seams
  • Tears
  • Leaking material
  • Movement from the designated position

During long periods of nonuse, severe weather, or seasonal storage, follow the manufacturer’s instructions for removing, rinsing, drying, and storing them.

How AquaCurve In-Pool Lounge Chairs Stay in Place

AquaCurve lounge chairs do not require the main chair body to be filled with water. They use supplied sandbags to improve stability on a shallow tanning ledge, sun shelf, or Baja shelf.

For the best fit and stability, AquaCurve recommends using its chairs in water up to 9 inches deep. Selected nonfolding models may be used in 10–12 inches of water with additional sandbag support obtained from AquaCurve, while the folding model should remain within its stated shallow-water range.

The sandbags support the chair’s pool-first geometry, but they do not replace the need for:

  • A suitable shallow-water ledge
  • An appropriate chair footprint
  • A reasonably flat surface
  • Correct water depth
  • Proper installation
  • Sensible placement away from strong water movement

AquaCurve offers different seating shapes for different pool layouts.

Compact Upright Lounge Chairs

Compact pool loungers in water are designed for smaller tanning ledges where a full-length chaise may occupy too much front-to-back space.

They are a practical choice when the owner wants to preserve room near steps, walking areas, or an in-pool side table.

Full-Length Chaise Lounge Chairs

Longer chaise-style chairs are designed for more spacious sun shelves. They provide a stretched-out reclining position but require more usable ledge depth.

Before ordering, measure the chair footprint against the actual ledge, not the total dimensions of the pool.

Chairs With Armrests and a Cup Holder

An upright lounge chair with armrests may suit users who prefer more defined side support and a convenient place for a drink.

The included sandbag remains part of the stability system and should be installed even if the chair feels heavy enough on the pool deck.

Folding Lounge Chairs

A folding model is the most storage-oriented option. Its removable sandbags, built-in handles, and flat-folding structure make it easier to move when the pool needs to be cleared for maintenance, weather, or seasonal storage.

Which Design Is Better for Your Pool?

A water-filled chair may be the better fit when:

  • You intend to leave the furniture in one position
  • You do not expect to rearrange the ledge frequently
  • You are comfortable with filling and draining the chair
  • The product’s fill system is easy to access
  • You have enough room to drain it properly

A sandbag-weighted chair may be the better fit when:

  • You regularly move or rearrange the furniture
  • You remove chairs before storms
  • You need seasonal storage
  • You do not want a large internal water chamber
  • You want to move the chair and ballast separately
  • You prefer a folding or portable model

You should also consider:

  • Normal pool water depth
  • Ledge length and width
  • Chair dimensions
  • Preferred sitting position
  • User height
  • Need for armrests
  • Need for a cup holder or side table
  • Available storage space

The best system is not simply the one with the greatest amount of weight. It is the one designed for your ledge, installed correctly, and used within its specified water depth.

Safety and Placement Considerations

Keep in-pool furniture away from areas where it may obstruct:

  • Pool steps
  • Handrails
  • Entry and exit routes
  • Narrow walking paths
  • Drains and circulation equipment
  • Areas that need to remain visible
  • Routine pool cleaning access

The Pool & Hot Tub Alliance publishes standards and guidance covering the design, construction, operation, and maintenance of pools and spas.[1]

The CDC Model Aquatic Health Code provides broader health and safety guidance for publicly accessible aquatic facilities, including hotel, apartment, HOA, and club pools.[2]

These sources do not recommend a particular lounge chair ballast system, so owners and operators should still follow the product manufacturer’s installation and operating instructions.

For residential pools, also follow local requirements and any instructions provided by the pool builder or surface manufacturer.

FAQ

Can I Use an AquaCurve Lounge Chair Without the Sandbags?

The supplied sandbags are part of the chair’s intended stability system. Install them according to the product instructions before using the chair in water.

A chair that appears stable on a dry pool deck may behave differently once it is partly submerged.

Do Sandbags Make an In-Pool Lounge Chair Completely Float-Proof?

No ballast system can guarantee that a chair will never move.

Stability also depends on water depth, ledge slope, water circulation, pool level, correct installation, and the geometry of the chair. Use the chair within the manufacturer’s recommended conditions.

What Should I Use to Fill an In-Pool Furniture Sandbag?

Use the material specified in the product instructions. When clean sand is recommended, avoid sharp gravel, stones, metal pieces, or other materials that may puncture the bag or damage the pool surface.

Make sure the closure is secured before placing the bag in the chair.

Should I Remove the Sandbags Before Moving the Chair?

Removing the ballast first can make a sandbag-weighted chair easier to lift. Follow the product instructions, lift instead of dragging, and use a second person when the chair is large or awkward.

Can I Add Extra Sandbags to Use the Chair in Deeper Water?

Only add sandbags when the manufacturer specifically approves that setup for the model and water depth.

Extra weight does not make every chair suitable for deeper water. Selected AquaCurve models may support additional sandbags in 10–12 inches of water, but the standard recommendation remains 9 inches or less. The AquaCurve folding chair should be used within its stated shallow-water limit.

Do I Need to Drain a Sandbag-Weighted Lounge Chair?

The chair body does not need to be drained for ballast in the same way as a water-filled chair. However, the chair and sandbags should still be rinsed and allowed to dry before long-term storage.

Is a Water-Filled Chair Heavier Than a Sandbag-Weighted Chair?

Either design can become heavy once its ballast is installed. The practical difference is that a sandbag can usually be removed separately, whereas the water in a water-filled chair must be drained from its internal chamber.

Can Water-Filled and Sandbag-Weighted Chairs Be Used in Saltwater Pools?

Compatibility depends on the materials and manufacturer’s instructions. For AquaCurve products, regular fresh-water rinsing is recommended after exposure to saltwater or heavily treated pool water.

References

[1] Pool & Hot Tub Alliance. PHTA Standards: Standards for the Design, Construction, Operation, and Maintenance of Pools, Spas, and Hot Tubs.
[2] Centers for Disease Control and Prevention. Model Aquatic Health Code: Guidance for Healthy and Safe Public Aquatic Facilities.

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