"How often should I clean my pool" is really three separate questions with three separate answers, and most advice online mashes them into one number. Testing runs on a fixed cadence. Pump run-time follows the season. Filter cleaning follows the pressure gauge, not the calendar at all. Get these three straight and the rest of pool care stops feeling arbitrary.
Testing your water: 2-3 times a week
Chlorine and pH drift fastest of anything in the pool, so this is the one item that genuinely wants a fixed schedule. Test free chlorine and pH two to three times a week in the swimming season, and once a week is usually enough over a cold winter when the pool isn't being used. If you've had heavy bather load, a storm, or a run of hot days, test again sooner rather than waiting for your usual day.
Test strips are fine for a quick read; a liquid test kit (the drop-count kind) is worth the extra thirty seconds if you're chasing an algae bloom or trying to work out your actual chlorine demand, because it's more precise at the low end where strips get unreliable.
Running your pump: the turnover-rate formula
Pump run-time isn't a guess, it's arithmetic. Turnover rate is how long it takes your pump and filter to circulate a volume of water equal to the whole pool once:
Turnover time (hours) = Pool volume (litres) ÷ Pump flow rate (litres per hour)
Example: a 40,000L pool with a pump moving 15,000L/hr gives a turnover time of about 2.7 hours. The rule of thumb most Australian techs work to is one full turnover in summer and roughly half that in winter, which in practice lands around:
- Summer: 8-10 hours a day (roughly two to three turnovers, since heat and bather load push chlorine demand up)
- Winter: 4-6 hours a day (about one turnover is enough with a cold, quiet pool)
If you don't know your pump's flow rate, it's on the data plate or spec sheet; a rough default for a typical residential single-speed pump is 12,000-18,000L/hr, but check yours rather than assuming.
Filter cleaning: this one isn't on a calendar
This is the item most generic advice gets wrong by giving you a number of weeks. A filter doesn't get dirty on a schedule, it gets dirty based on how much debris and bather load actually passed through it, so two identical pools can need cleaning at very different intervals. The honest trigger is your filter's pressure gauge: clean or backwash when the reading is roughly 8-10 PSI above the clean baseline you recorded right after the filter was last cleaned. No gauge reading, no clean date -- that's the correct amount of precision here, and it's more accurate than a made-up "every six weeks."
Write your clean baseline pressure on a bit of tape near the gauge so you're not trying to remember it. Check the gauge weekly; that's the calendar-based habit, even though the clean itself isn't.
Putting it together
| Task | How often | Trigger |
|---|---|---|
| Chemical test | 2-3x/week (summer), weekly (winter) | Fixed schedule |
| Pump run-time | 8-10 hrs/day (summer), 4-6 hrs/day (winter) | Turnover formula + season |
| Filter check | Weekly gauge check | Clean when +8-10 PSI over baseline |
| Salt cell check | Every 2 months | Visible calcium scale (see our salt vs chlorine guide) |
For the full seasonal and daily/weekly breakdown across everything, see our pool maintenance checklist.