Outdoor Summer Pools: Ready to Swim in a Weekend

A portable outdoor pool does not need a contractor, a permit for a hole or a month of works. It needs a good spot, a level base and one unhurried weekend. Here is that weekend, in order, with the parts people get wrong flagged as they come up.

Saturday morning: choose the spot

Getting this right saves you from moving a filled pool, which is not something anyone does twice.

Sun. Six hours of direct sun keeps the water noticeably warmer with no equipment at all. Track where the shade falls at midday rather than at breakfast, because the two are very different.

Trees. Anything overhanging drops leaves, blossom, sap and insects into the water continuously. Being two metres clear of a canopy saves more skimming than any accessory you can buy.

Wind. An exposed spot loses heat and water to evaporation far faster. A fence or hedge on the prevailing wind side makes a measurable difference, provided it does not shade the pool.

Services. You need a hose within reach for filling and topping up, and a power point for the filtration unit. Extension leads running across a wet lawn for a whole season are a bad idea.

Sightlines. For families, being able to see the pool from inside the house is a safety feature, not a nicety.

Drainage. Water will splash out, and the pool will eventually be drained. Do not choose the low point of the garden, and do not put it hard against a wall.

If you are still choosing between diameters at this stage, the size and ground guide covers space and ground together in two questions.

Saturday midday: level the ground

This is the step that decides whether the pool looks right or looks tilted all summer. Water levels itself, so any slope shows up as a deep side and a shallow side, and it loads one section of wall harder than the rest.

1. Clear the area of stones, sticks and anything sharp. The floor carries the entire water column.

2. Lay a straight plank across the area and put a spirit level on it. Check in two directions at right angles.

3. Correct by cutting down the high side, not by building up the low side. Loose fill compresses under the weight of water and the pool ends up tilted anyway.

4. Lay a ground mat. It protects the floor, evens out minor texture and slows heat loss into the soil.

Level lawn, compacted soil and flat paving all work. Soft sand, loose gravel and freshly turned soil do not. If you are placing the pool on a deck, confirm the deck is rated for the load before anything else, because a filled pool is heavy and the weight is concentrated over a small footprint.

Saturday afternoon: set up and start filling

With a drop-stitch pool, an electric high-pressure pump with an automatic cut-off inflates the walls in minutes and stops at the correct pressure. Under-inflation is the usual reason a wall looks soft, and it is also the usual reason a pool ends up looking slightly oval.

Position the pool exactly where you want it before filling. Once there is water in it, it is not moving.

Filling is the long part of the weekend and the part you do not have to supervise. How long depends entirely on your water pressure. Start it in the afternoon and let it run while you set up the filtration unit and the ladder, and check that the cover you bought matches your diameter.

The smallest pool in the range, the Circle 3.0 m, fills fastest and heats up fastest, which is worth knowing if you are starting late in the season.

Still shopping? See the three diameters, both depths and what ships in the box.

Sunday morning: water and circulation

Two things keep a summer pool clear: water that keeps moving, and water that is chemically balanced. Neither works without the other.

Circulation. Run the filtration for a few hours a day to start, and increase the hours as the water warms and use increases. Warmer water and more swimmers both raise the load.

Balance. Test the water and adjust it. The order that works is pH first, then sanitiser, because chlorine becomes markedly less effective outside the right pH band. The Centers for Disease Control publishes the reference ranges for home pools, including pH and the minimum free chlorine level to maintain, with a higher minimum where a stabiliser is used. Dose for your actual volume, following the instructions on the products you have bought, and always add product to water rather than water to product.

Volume. Know roughly how many litres your pool holds, because every treatment instruction is expressed per volume. The figure is on the product page for your diameter and depth.

The rest of the season: the routine that keeps it easy

• Skim daily. Anything floating is easy to remove. Anything that sinks needs a cleaner or a net on a pole.

• Cover it at night. The US Department of Energy notes that evaporation is by far the largest source of energy loss from a pool, and that covering it when not in use is the single most effective way to reduce heating costs. In a hot climate it is also your largest water loss. The thermal cover comes in three sizes matched to the three diameters. It is not a safety cover.

• Rinse before swimming. Sunscreen, sand and garden dirt are the main things your filtration has to deal with. A solar shower at the poolside removes most of it before it reaches the water.

• Test weekly, and after heavy use or heavy rain.

• Watch the level. Evaporation is normal. A drop that continues overnight with the cover on is worth investigating.

Everything on that list, plus the optional upgrades, sits on the accessories collection.

Safety, all season

Supervision is the measure that works, and nothing else replaces it. Beyond that:

• Remove or lock the ladder when the pool is not in use. It takes ten seconds and it is the simplest access restriction there is.

• Keep the area around the pool clear of anything a child could climb on.

• Know the rule that applies to you. In South Africa, controlling access to a private pool falls under the National Building Regulations, with SANS 10134 covering safety around private pools, and municipalities can impose stricter by-laws on top. The law firm STBB publishes a readable summary of that framework.

The threshold in most jurisdictions is water depth rather than pool type, which means a portable pool is very often inside the rules rather than outside them. Check before you buy, not after the pool is standing in the garden.

End of season: pack it down properly

1. Drain to somewhere that can take the volume, and check your local rules on where treated water may go.

2. Rinse the inside.

3. Dry completely. This is the step that decides what condition the pool is in next year. Anything folded away damp will grow mould along the creases.

4. Fold flat and store indoors, out of direct sunlight.

5. Store the pump, filtration unit and hoses dry, and keep the repair kit with the pool so you can find it next season.

In a mild climate many owners simply leave the pool up all year. Where the water freezes, take it down before the first frost, because expanding ice puts stress on any pool wall.

Frequently asked questions

How long does it take to set up an outdoor summer pool? Inflating and positioning takes minutes. Filling takes as long as your water pressure allows and is usually the longest part of the day.

What size pool for a small garden?

A 3.0 m diameter fits where larger pools cannot, heats up fastest and uses the least water. Allow about a metre of clear space around it.

How do I keep the water clear without chemicals?

You cannot, entirely. Circulation, skimming and a cover reduce the chemical load substantially, but any pool kept filled for weeks in summer needs a sanitiser.

Can I heat an outdoor pool cheaply?

The cheapest heat is free: a sunny position and a thermal cover kept on overnight. Both together add more usable weeks than most owners expect.

What do I do if it punctures? Every Hippool ships with a repair kit. More answers on the FAQ page.

Planning the weekend? Check your space and ground first, it takes about a minute.

Ready to buy? Pick your diameter and depth.