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Thread: What stays on top: Rainwater or chlorinated water

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    What stays on top: Rainwater or chlorinated water

    Rainy season in the Philippines and the rainwater is lowering our Poolwater ph to 6.8 from 7.5 so I had to add 1650 grams of soda ash.

    If the rainwater stays t least for a while on top of the chlorinated water, an overflow drain tube could drain the excess rainwater.

    So what floats on top? Does anyone has an answer to that?

    I use granulated trichlor about 5 or more ppm.
    Hayward Pump SP2805X7 Hayward Sandfilter S210T used by switching a manual threeway valve for either a IG overflow pool with 3700 Gal. or a second IG skimmerpool with 5550 Gal., both tiled with and white cement/beachsand rim, the upper pool with sculptured white cement/beachsand waterfall.

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    Mod Squad jblizzle's Avatar
    Join Date
    May 2010
    Tucson, AZ

    Re: What stays on top: Rainwater or chlorinated water

    If the pump is off, I would think the rain will stay on the top layer for at least a little while. Although it is likely colder than the pool water so will start to mix from convection.
    Jason, TFP Moderator
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    Join Date
    Mar 2007
    San Rafael, CA USA

    Re: What stays on top: Rainwater or chlorinated water

    To get the pH lowered that much your rain must be quite acidic AND you must have an awful lot of rain. This chart shows average monthly rainfall in July of around 13" and in August of around 16" so that is indeed a lot of rain especially if it doesn't evaporate quickly (and it probably doesn't given the humidity).
    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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