Pool Maintenance Basics
How pool volume drives sanitiser dosing, filter runtime and water testing — a practical maintenance primer.
· 8 min read
Clear water is a circulation and chemistry problem, not a mystery. Once you know how many litres you are treating, sanitiser labels, filter run-times and salt-cell settings start to make sense.
Know the volume first
Almost every dose is written as “X grams (or millilitres) per 10,000 litres” or “per 10,000 US gallons”. Guessing the volume by eye is how pools go cloudy after a shock treatment. Use the volume calculator, then write the litres figure on the plant-room wall.
Test before you dose
Measure pH, free chlorine (or bromine) and total alkalinity at least twice a week in the swimming season. pH that sits high makes chlorine lazy; pH that sits low eats metal fittings. A drop kit is more repeatable than strips for chlorine, but strips are better than not testing. See the testing kit buying guide.
Circulation and filtration
A useful rule of thumb is to turn the water over at least once per day. If the pump moves 10 m³ per hour and the pool holds 48 m³, that is a little under five hours of runtime — longer when the pool is busy or the weather is hot. Empty the skimmer and pump baskets so the pump is not starved of water.
Cleaning
Skim the surface daily with a net, brush walls weekly, and vacuum when you can see settled dirt. Debris that sits on the floor becomes algae food. A telescopic pole that reaches the deep end without leaning over the water is safer than stretching.
Sanitiser and shock
Chlorine demand scales with volume and with bather load. Shock treatments are labelled for a stated volume — using a 50,000-litre dose on a 25,000-litre pool is how liners bleach and eyes sting. After you dose, keep people out until free chlorine is back in the swimming range printed on the product.
Helpful kit
Related reading: how to measure a pool and litres to gallons if your product is labelled in gallons.