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Thread: Rain water

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    Join Date
    Jun 2010
    Location
    Central Indiana
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    92

    Rain water

    What effect does rainwater have on my pool? It is still a little low, should I allow it to fill up with rain (gotta be better then my well water right?) or is rain water bad for the pool? I guess I dont know if I should keep the cover on or off during rainy days
    13500 gallon AG (24' round), 100 sf cartridge filter, Hayward 1hp pump, pool 10-15 years old with recently replaced liner

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    Join Date
    Jul 2008
    Location
    Sinking Spring, PA
    Posts
    58

    Re: Rain water

    I never had any problems with rain water. For me it seems to lower the pH a little bit (acid rain maybe?).
    4th Year Pool owner in Sinking Spring PA
    46'x23' Free Form Concrete (34,000 gallons), Aqua Blue Pebble Sheen Finish, Pentair IntelliChlor SWG
    Pentair Intelliflo Variable Speed Pump, Pentair D.E. FNS Filter, Pentair MasterTemp heater.

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    poolgirl22's Avatar
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    Apr 2010
    Location
    Stephens City, VA
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    595

    Re: Rain water

    Its free for me.
    That makes it perfect.
    Backyard pool-less, but used to be.....
    16,100 gallon, 18x38 3.5 ft deep oval AG, Vinyl, Sand, 1hp pump
    http://www.poolservicestech.com Liquidator
    http://www.poolcalculator.com/
    http://www.tftestkits.net TFT100 test kit

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    Join Date
    Feb 2008
    Location
    Denton, TX
    Posts
    5,061

    Re: Rain water

    Quote Originally Posted by poolgirl22
    Its free for me.
    That makes it perfect.
    I'm with you there!

    Rain typically has very little effect on things as it is fairly inert. If anything, it tends to aerate a little bit (pH goes up slightly). The biggest problem for people if they get lots of rain and don't have enough chlorine. Rain does carry a goodly amount of organic contaminants and so FC can go down pretty quick. Left unchecked, you can get algae in short order. But if you maintain your pool well and keep the FC at target, you'll be alright.

    If I see rain coming on the radar, I will often bump the FC a tad before it makes it to me. But then, I'm a geek like that.

  5. Back To Top    #5

    Join Date
    Jul 2008
    Location
    Sinking Spring, PA
    Posts
    58

    Re: Rain water

    If I need to back flush, I do so after a big rain when my pool is over filled. Saves me $$$ on adding water.
    4th Year Pool owner in Sinking Spring PA
    46'x23' Free Form Concrete (34,000 gallons), Aqua Blue Pebble Sheen Finish, Pentair IntelliChlor SWG
    Pentair Intelliflo Variable Speed Pump, Pentair D.E. FNS Filter, Pentair MasterTemp heater.

  6. Back To Top    #6

    Join Date
    Feb 2008
    Location
    Denton, TX
    Posts
    5,061

    Re: Rain water

    Quote Originally Posted by primetime
    If I need to back flush, I do so after a big rain when my pool is over filled. Saves me $$$ on adding water.
    Yep, that's a good time to take advantage of a situation like that.

  7. Back To Top    #7
    poolgirl22's Avatar
    Join Date
    Apr 2010
    Location
    Stephens City, VA
    Posts
    595

    Re: Rain water

    Quote Originally Posted by 257WbyMag
    Quote Originally Posted by poolgirl22
    Its free for me.
    That makes it perfect.
    I'm with you there!

    Rain typically has very little effect on things as it is fairly inert. If anything, it tends to aerate a little bit (pH goes up slightly). The biggest problem for people if they get lots of rain and don't have enough chlorine. Rain does carry a goodly amount of organic contaminants and so FC can go down pretty quick. Left unchecked, you can get algae in short order. But if you maintain your pool well and keep the FC at target, you'll be alright.

    If I see rain coming on the radar, I will often bump the FC a tad before it makes it to me. But then, I'm a geek like that.
    Good. I'll blame my last 'issue' on the rain. Isn't there an old millie vanilli song.....nevermind. Putting the FC bump prior to coming monsoons in the 'ole beartrap...
    Backyard pool-less, but used to be.....
    16,100 gallon, 18x38 3.5 ft deep oval AG, Vinyl, Sand, 1hp pump
    http://www.poolservicestech.com Liquidator
    http://www.poolcalculator.com/
    http://www.tftestkits.net TFT100 test kit

  8. Back To Top    #8

    Re: Rain water

    Quote Originally Posted by newguyjosh
    What effect does rainwater have on my pool? It is still a little low, should I allow it to fill up with rain (gotta be better then my well water right?) or is rain water bad for the pool? I guess I dont know if I should keep the cover on or off during rainy days
    1 - rainwater is free
    2 - rainwater has no CYA, no FC, no CH and no TA (probably unless you are in a dusty area?)
    3 - rainwater effect on pH can be higher or lower
    4 - rainwater may also come with leaves and branches or mud from landscaping increasing chance for algae growth
    5 - when the pool gets full and overflows all chemicals in the pool are reduced
    6 - how the pool overflows may be a consideration

    So, if your chemicals are perfect and you have trees and landscaping that create debris in the pool then I'd keep it covered. If your CYA or CH or TA are a bit high then I'd leave the cover off for some dilution. If where and how the pool overflows could create a problem with drainage, then beware of that. In any case you will have less FC by a little or a lot if there is debris added, so you need to bump chlorine up a bit afterward. If your water source is problematic, like metals in well water, then free clean water is wonderful and you can deal with the rest of it.
    23,000 gallon in ground pool with rock waterfall and spillover spa, Aqualink control system, Polaris 380 cleaner, Purex Triton Clean&Clear Plus cartridge filter. Located in The Woodlands, Texas.

    Pool owner since Nov 2008, Trouble Free since April 2009. Happy to help when I can.

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