Seven ways to cut a pool's running cost, ranked by what they actually save

The arithmetic everything below uses

One formula, applied consistently, so the measures can actually be compared. Watts times hours times days, divided by a thousand, times your rate. We use the EIA US residential average of 18.34 cents per kWh throughout and a 120-day season; substitute your own numbers from your bill.

The ranking

One: cut the run time to what turnover actually needs

The default advice of eight hours a day comes from inground pools of tens of thousands of gallons. On a 1,718-gallon pool with a 475 GPH system flow, one complete turnover takes about 3.6 hours — so eight hours is more than two turnovers, which is filtration you are paying for and not using.

Work out your own figure: gallons divided by the pump’s published system flow rate, then one to two turnovers a day. Our run-time guide does it properly and the sizing guide explains why the system flow rate is the right number rather than the headline one.

A timer is what makes this stick, and it must be outdoor-rated, matched to the pump’s amperage and fitted downstream of the GFCI — see our electrical safety guide.

Two: the cover, which saves three things at once

A bubble solar cover is the only item on this list that reduces more than one line. It cuts evaporation, which is water you do not buy and re-balance. It retains heat, which is heating you do not pay for. And it keeps debris out, which is chlorine demand that never happens and a cartridge that lasts longer.

Two conditions, both frequently got wrong. Bubbles face down, toward the water. And buy a reel with it, because a wet cover wrestled off by hand twice a day stops being used within a month, at which point it saves nothing at all. Our solar cover roundup covers thickness and fit.

Three: fresh filter media

A loaded cartridge quietly raises the resistance the pump works against and lowers the effective system flow rate. The pump draws roughly the same power and delivers less, so your real turnover time stretches and you compensate by running it longer — paying for hours to make up for a part that costs very little.

Intex guidance for Type A cartridges is replacement roughly every two weeks in heavy use, with rinsing rather than scrubbing in between. Our cartridge guide covers stretching the interval honestly, and skimming daily is the cheapest way to do it.

Four: split the run, do not extend it

Two shorter blocks — late morning and evening — circulate across the whole active part of the day for the same total hours as one long block. It costs nothing on any timer and it means chemicals distribute when they are added and the water moves when demand is highest.

Five: sizing, which only pays at replacement time

An oversized pump costs about $17.61 a season for every extra 100 W it draws, running 8 hours a day. That is a real number and it is worth getting right — but only when you are buying a pump anyway. Replacing a working pump to save it rarely pays back.

Six and seven: the two that disappoint here

Off-peak scheduling works only if your tariff genuinely differentiates, and it fights the reason to run the pump in the first place: chlorine demand is highest in heat and while people are swimming. On a pool whose whole season of pump electricity is around fifty dollars, shifting hours to save a few percent is not where the effort belongs.

Upgrading to a certified pump is genuinely worthwhile on the right pool, but the published figure is modest: ENERGY STAR states that a certified above-ground pool pump saves about $20 a year, being about 11 percent more efficient. Against the price of a new pump, that is a long payback — and the same $20 is available for free by cutting three hours a day off the schedule.

The order to actually do them in

Fit the timer and set the run time from your own turnover figure. Buy the cover and the reel. Keep the cartridge fresh and skim daily. Split the run into two blocks. Then stop — the remaining measures are either replacement-time decisions or rounding.

Put the effort you would have spent on the last three into the season length instead. A cover that adds usable weeks in May and September improves the cost per swim more than any saving here improves the cost per season, which is the framing our cost per swim guide uses.