Swimming pools come in many different types — including both in-ground and above-ground pools. Among above-ground options, the frame pool is a popular choice — an above-ground basin set up for the swim season and winterized when done. Built around a steel frame structure holding a PVC liner, it needs to be installed on the right surface to perform well and last.
Here's everything you need to know about preparing the ground and choosing the right base for your frame pool.
Why Is Ground Preparation Essential for a Frame Pool?
Proper ground preparation is non-negotiable before installing a frame pool. The ground must be completely flat — even a slight slope makes installation impossible. It also needs to be fully cleared of stones, roots, and debris that could damage the liner. No shortcuts here.
Also check out our related guides: "what to put under an above-ground pool", "how to dress up your frame pool", and "how to choose your frame pool".
Step 1 — Choose the Right Location
Before anything else, check out the best frame pools on the market:
Whether you're installing an Intex frame pool, a rectangular model, or a round frame pool, location matters. Choose a sunny spot to naturally warm the water and maximize swimming comfort. Keep it away from trees to avoid leaves and debris falling in. And make sure the spot is close to a power outlet for your filtration system and near a water source for easy filling.
Step 2 — Prepare the Ground
Once you've chosen the spot, it's time to prepare the surface. Follow these steps carefully for a solid, stable installation.
Mark Out the Pool Dimensions
Start by marking out the exact footprint of your pool on the ground. Whether round or rectangular, you need a clear outline of the space it will occupy.
Clear the Ground
Remove 2–4 inches of topsoil and strip away any lawn within the marked area to prevent bumps. Then clear all stones, roots, and plant debris — anything left behind could puncture the liner during use.
Level the Surface
Use a mason's rule or electronic level to confirm the surface is perfectly flat. Leave enough clear space around the pool for easy circulation — and consider adding a small pool deck or border area to avoid tracking dirt into the water.
Step 3 — Choose the Right Base Material
A frame pool can never be placed directly on bare ground. You'll need one of these base solutions:
Sand Bed
Sand is one of the most common base materials for frame pools. A layer of 1–1.5 inches is enough to level the surface and stabilize the structure. Don't overdo it — too much sand compacts unevenly over time. You can reinforce it by mixing in filter sand, a little cement, and water for added stability.
Lawn / Grass
If you'd rather not dig, you can leave the lawn in place — but it needs to be mowed very short and fully cleared of debris and stones. Keep in mind that once you dismantle the pool, the grass underneath will likely be:
- Damaged from the pressure of the pool;
- Discolored from lack of sunlight;
- Slow or unable to recover.
Concrete Slab
The most solid option for larger rectangular, oval, or round frame pools, a concrete slab provides a perfectly flat and weight-bearing surface — far more stable than bare earth when supporting a full basin of water.
Step 4 — Add Ground Protection
Geotextile Membrane
A geotextile membrane works for multiple pool types and prevents plant regrowth that could pierce the liner over time. Think of it as a carpet under the pool. When laying it, treat it against bacteria and fungi — and make sure it lies perfectly flat to avoid any bumps that could affect swimming comfort.
Ground Mat
A pool ground mat is one of the most important accessories for frame pool installation. It protects the liner base from debris and sharp objects, provides a smooth, flat surface, and — crucially — helps prevent tears and punctures that lead to leaks. It also adds a layer of thermal insulation, reducing heat loss through the bottom and helping maintain a comfortable water temperature. Always choose a high-quality, size-appropriate ground mat for the best long-term performance.
We hope this guide helps you choose the right base and set up your frame pool with confidence. And to add some fun and personality to your pool, check out our giant animal inflatable floats:
FAQ: What to Put Under a Tubular Pool
What surface should I place a tubular pool on?
Place your tubular pool on a flat (tolerance ±2 cm), clean and stable surface. Short grass is ideal. A concrete slab with a slight slope (2%) for water drainage is excellent. Avoid gravel alone (unstable, can puncture the liner) and naturally sloped ground (over 2% slope causes frame deformation).
Do I need to put something under a tubular pool?
Yes, it is recommended to place a geotextile ground cloth or foam mat under the pool liner. This protects the liner from stones and roots, improves underfoot comfort and extends the lining's lifespan. For larger tubular pools, a concrete slab with geotextile is the most durable solution.
Can I place a tubular pool on soil?
Technically yes, but it is not recommended. Uncompacted soil settles under the weight of water, causing frame deformation. Stones and roots can also puncture the liner. If you only have soil, level it, compact it, and lay a thick geotextile sheet before setting up the pool.
Can I install a tubular pool on a wooden deck?
Yes, provided the deck is strong enough to support the weight of the water (1,000 kg/m³). Check the load capacity before installation. An 8,000-litre pool exerts approximately 8 tonnes of pressure on the ground surface. Protect the wood with an intermediate ground mat to avoid marks and prolonged moisture.
How do I prepare the ground before installing a tubular pool?
Mow short or remove grass from the area. Remove all stones, roots and debris. Level with a shovel and rake (check with a spirit level). Compact with a roller or by treading. Lay a geotextile mat or protective sheet. Ground preparation is the most important step for the longevity of your pool.
