The rule behind pump run time: one turnover a day
Your pump's job is to circulate every gallon through the filter at least once a day — that's one "turnover." Circulating water is filtered, sanitized, and protected from algae; still water is where trouble starts. Most residential pumps move the full pool volume in roughly 8 to 12 hours, which is why that's the summer target. It's not about running the pump constantly; it's about running it long enough to cycle all the water through cleanly each day.
Seasonal run-time guide for Granada Hills
Runtime should follow the season. Granada Hills summers in the west valley climb hot — frequently into the upper 90s and past 100 on the worst stretches — and heat is what drives the schedule. Warm water burns off chlorine faster and grows algae faster, so you run longer when it's hot.
| Season | Typical daily run time |
|---|---|
| Peak summer (hot, heavy use) | 10 – 12 hours |
| Spring / fall (mild) | 6 – 8 hours |
| Winter (cool, low use) | 4 – 6 hours |
| After a Santa Ana / heavy debris day | Add 1 – 2 hours |
Rule of thumb: in a Granada Hills summer, run the pump at least 1 hour for every 10°F of high temperature — so a 100°F day wants around 10–12 hours. When in doubt during a hot stretch, run it longer; under-running in this heat is what invites a green pool.
Why heat and dust make us run longer here
Two local realities lengthen the schedule. First, the heat: a hillside pool in Knollwood or Granada Hills Estates baking in full valley sun loses chlorine quickly, and the pump has to circulate enough to keep sanitizer working through the water. Second, the dust and debris: Santa Ana winds and dry foothill stretches drop fine dust and leaf litter onto the surface, and the pump-and-filter system is what pulls that out. After a windy day, an extra hour or two of run time helps the filter catch up before the load settles and clouds the water.
The LADWP money-saver: variable speed + off-peak hours
Longer runtime sounds expensive, and on an old single-speed pump it is — that motor is one of the biggest electricity users in the house. The fix is two-part. A variable-speed pump runs slow and quiet for most of the day, moving the same water for a fraction of the energy, and modern California efficiency rules make it the standard choice on replacement. Then schedule the heavy circulation during LADWP off-peak hours — generally overnight and early morning, away from the late-afternoon peak — so you're turning the pool over when power is cheapest. Run long, but run slow and run off-peak, and a longer schedule actually costs less than a short blast on an old single-speed.
What happens if you under-run it
Cutting the pump too short to save a few dollars usually backfires in the heat. Water that doesn't fully turn over each day lets chlorine pool unevenly, lets dust and debris settle, and gives algae the still, warm conditions it loves. The cloudy-then-green pool that follows costs far more to recover than the electricity you saved. In a Granada Hills summer, a correctly sized run time is cheap insurance.
Dial in your pump schedule
The right number depends on your pump, pool size, and how your equipment is set up. A quick look gets you a tuned summer and winter schedule — and if you're on an old single-speed motor, an honest read on whether a variable-speed upgrade would pay for itself, with a firm quote and no obligation.
Granada Hills Pool Service FAQs
How many hours a day should I run my pool pump in Granada Hills?
About 8 to 12 hours a day in summer and 4 to 6 in winter — enough to turn the whole pool over once. Our hot valley summers push toward the high end, so on a 100°F day plan for 10 to 12 hours, and add an hour or two after a windy, dusty Santa Ana day.
Should I run the pump during the day or at night?
Schedule the bulk of your run time during LADWP off-peak hours — generally overnight and early morning — to avoid the costly late-afternoon peak. Running a couple of hours in daylight is fine for skimming and chemical mixing, but the heavy turnover is cheapest off-peak.
Will a variable-speed pump really save money?
Usually a lot. A variable-speed pump moves the same water at a slow setting for a fraction of the energy of an old single-speed motor, which is one of the biggest power draws in the home. Combined with off-peak scheduling, it lets you run the longer hours our heat needs while cutting the electric bill.
Can I run the pump less to save on my LADWP bill?
Cutting it too short tends to backfire in our heat. Under-circulating lets chlorine spread unevenly, lets dust settle, and gives algae the still, warm water it needs — and a green-pool recovery costs far more than the power you'd save. The smarter saving is a variable-speed pump on off-peak hours, not fewer turnover hours.
Do I need to run the pump longer after a windy or dusty day?
Yes. Santa Ana winds and dry foothill stretches drop fine dust and debris onto the water, and the pump-and-filter system is what clears it. Adding an extra hour or two of run time after a windy day helps the filter catch up before the load settles and clouds the pool.
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