Where the Money Actually Goes
Before you cut anything, know what you're cutting. For most pools the monthly bill is dominated by one line: electricity to run the pump — and an oversized pump burns that money every hour it runs, so it is worth checking yours against the pool pump size calculator. Chemicals come second, water top-off third, and if you hire a service, that line usually dwarfs everything else combined.
That order is the whole strategy. The cheapest savings aren't found by buying less chlorine — they're found by running the pump smarter and stopping heat, water, and chemicals from evaporating away. The list below is ranked by return, not by effort.
One detail decides how much of that electricity bill is avoidable: the pump was almost certainly bought on horsepower, and horsepower is the wrong number. What actually determines flow is total dynamic head (TDH) — the combined resistance of your pipes, elbows, valves, filter and heater, measured in feet. Manufacturers publish flow against head, so the only honest comparison is GPM at your TDH. Worse, the figure on the label is often brake horsepower: the motor's rated HP multiplied by its service factor, so a "1 HP" pump can really be a 1.65 HP motor drawing 1.65 HP worth of electricity. Right-size against your filter and plumbing instead, and the savings arrive every single hour the pump runs.
Measure first
Run your current numbers through the maintenance-cost calculator before changing anything. You can't tell if a fix paid off if you never knew the starting bill.
The Top 3 by ROI
If you do nothing else, do these three. Each pays for itself and keeps paying.
Use a pool cover
The single highest-return move. The U.S. Department of Energy reports a cover can cut pool heating and evaporation by roughly 50–70%. Less evaporation also means less water top-off and less chemical loss. One purchase, three line items reduced. If you heat the pool at all, this is non-negotiable.
Switch to a variable-speed pump
Single-speed pumps run flat-out all day. A variable-speed pump filters at a low, efficient RPM most of the time and can cut pump electricity by 50–75% — which matters because the pump is usually your biggest pool expense. New U.S. efficiency rules (10 CFR 431) already mandate variable-speed for most replacement pumps, so you'll likely buy one anyway; do it sooner.
Drop chlorine tabs for liquid chlorine
Stabilized tabs (trichlor) add cyanuric acid every time you use them. CYA creeps up, your chlorine gets weaker, you compensate with more chlorine — and eventually you have to drain and refill to reset it. Liquid chlorine adds no CYA, so you avoid that whole spiral and the wasted water. Cheaper per dose of sanitizing power in most regions, too.
See Your Monthly Bill
Estimate your current monthly maintenance cost, then change one input at a time to see what each fix saves.
Open Maintenance Cost CalculatorThe Full Ranked List
Ten ways to cut the bill, highest return first:
Use a pool cover
Cuts heat, water, and chemical loss in one move (DOE: 50–70% heating reduction).
Variable-speed pump
Filter at low RPM most of the day — 50–75% less pump electricity.
Liquid chlorine over tabs
No CYA creep, no forced drain-and-refill, cheaper per dose.
Run the pump fewer hours
Most pools only need one full turnover a day, often 6–8 hours, not 24.
Do your own testing & dosing
Drops the service line entirely — often the biggest single saving.
Keep CYA in range
High stabilizer wastes chlorine; correct CYA means every dose works harder.
Run the pump off-peak
Where utilities charge time-of-use rates, shift filtering to cheaper hours.
Keep the filter clean
A dirty filter makes the pump work harder and longer for the same flow.
Maintain steady chemistry
Balanced water rarely needs expensive corrective shocking or clarifiers.
Lower the water temperature
Every degree you don't heat is money saved — drop it a notch or skip heating shoulder weeks.