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Thread: First winter with pool chem questions

  1. Back To Top    #1

    Join Date
    Aug 2015

    First winter with pool chem questions

    I am located in Northern California where I may get snow possibly once a year. While I don't plan on using the pool during the winter, I also did not plan to cover it. Is that a mistake? Is there a chemistry that needs to change during the winter months? Also, with the expected El Niņo coming, is there anything I should do?

  2. Back To Top    #2

    Join Date
    Mar 2007
    San Rafael, CA USA

    Re: First winter with pool chem questions

    Unless you get a hard freeze over a significant period of time, you can keep your pool open in the winter which means you still keep it circulating with water though can run the pump over a shorter time. If you do expect freezing temperatures, you can run your pump during that time (on low speed) and that will prevent the water freezing in the pipes. You would maintain similar water chemistry in the winter except that your pH target will be a little higher (say, 0.2 units higher) but that usually happens normally as the water gets colder. You should find your chlorine usage dropping significantly with the colder water and lower angle of the sun (and more cloudy days).

    You can use the rains from El Niņo to refresh (dilute) your water to keep salt levels in check since otherwise they would build up. This assumes you are using chlorinating liquid or bleach. If you are using stabilized chlorine (e.g. Trichlor or Dichlor) then your CYA may be too high or if you are using Cal-Hypo then your CH may be too high. You can use the winter rains to dilute the water and not pay for it from fill water.
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
    12 Fafco solar panels; Purex Triton PowerMax 250 natural gas heater (200,000 BTU/hr output); automatic electric pool safety cover; 4-wheel pressure-side "The Pool Cleaner"

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