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Thread: Partial drain of pool....

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    samwestx's Avatar
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    Partial drain of pool....

    In trying to lower CYA, if I drain pool below return jets, is it OK to still use equipment "as usual" while it refills via water leveler?

    15000 gallon pool (15x30 + 7x7 sitting area), IG-Blue Pebble, Sand Filter-Hayward Pro Series, Pump-Hayward Tristar VS pump, Water Test Kit-TF 100, NEW POOL-COMPLETED ON 5/7/16, City Water w/no restriction, Dolphin M400

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    samwestx's Avatar
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    Re: Partial drain of pool....

    Have a CYA of 70-80.....hard to tell indoors or currently cloudy outdoors.....FC didn't move in a week from 4FC (target)......CYA didn't move either (70).....have had little rain throughout this week....is CYA best measured in SUNNY conditions?

    15000 gallon pool (15x30 + 7x7 sitting area), IG-Blue Pebble, Sand Filter-Hayward Pro Series, Pump-Hayward Tristar VS pump, Water Test Kit-TF 100, NEW POOL-COMPLETED ON 5/7/16, City Water w/no restriction, Dolphin M400

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    samwestx's Avatar
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    Re: Partial drain of pool....

    Today's readings....
    FC-4
    CC-0
    TC-4
    CH-550
    TA-100

    15000 gallon pool (15x30 + 7x7 sitting area), IG-Blue Pebble, Sand Filter-Hayward Pro Series, Pump-Hayward Tristar VS pump, Water Test Kit-TF 100, NEW POOL-COMPLETED ON 5/7/16, City Water w/no restriction, Dolphin M400

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    samwestx's Avatar
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    Re: Partial drain of pool....

    I know CH is high, ALWAYS has been.....clear water

    15000 gallon pool (15x30 + 7x7 sitting area), IG-Blue Pebble, Sand Filter-Hayward Pro Series, Pump-Hayward Tristar VS pump, Water Test Kit-TF 100, NEW POOL-COMPLETED ON 5/7/16, City Water w/no restriction, Dolphin M400

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    Mod Squad pooldv's Avatar
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    Re: Partial drain of pool....

    The autofill will be too slow, stick a hose or two in there too.
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    Mod Squad Jimrahbe's Avatar
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    Re: Partial drain of pool....

    Quote Originally Posted by samwestx View Post
    In trying to lower CYA, if I drain pool below return jets, is it OK to still use equipment "as usual" while it refills via water leveler?

    Sent from my SAMSUNG-SM-G900A using Tapatalk
    Sam,

    Maybe I just don't understand the question, but if you drain the water below the return lines, you can't use your equipment "as usual". Your water will be way below the Skimmers and your pump will just be sucking air. If you have the right valves, you may be able to shut off the skimmers and only select the main drain and run your system that way.

    Thanks,

    Jim R.
    Finished in 2015 - 17K Gal, IG, 20' x 25' Almost Rectangular Pool, Pebble finish, three rockport water falls. Pentair Equipment: EasyTouch 4, IC40 SWG, 3 HP VS Pump, CCP520 Cartridge Filter.
    TF100 with SpeedStir and SampleSizer, ColorQ Pro 7, Dolphin Premier Robot Cleaner, added Screen Logic 2, added small 3 person Calder Spa.

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    samwestx's Avatar
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    Re: Partial drain of pool....

    Jim,

    I do have valves to shut off skimmers IF I wanted to do lower level during the day with pump in use....my plans are to fill most if not all night, so pump wouldn't suck air......I'm well aware of the slight drop in FC from pool math (should be 6 on low end with that CYA), but Dolphin manufacturer states not to use in FC over 4? What to do? Thanks!

    15000 gallon pool (15x30 + 7x7 sitting area), IG-Blue Pebble, Sand Filter-Hayward Pro Series, Pump-Hayward Tristar VS pump, Water Test Kit-TF 100, NEW POOL-COMPLETED ON 5/7/16, City Water w/no restriction, Dolphin M400

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    Mod Squad Jimrahbe's Avatar
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    Re: Partial drain of pool....

    Sam,

    The worst thing it will do to your Dolphin is fad the plastic. But, it seems that what you are doing makes sense.. drain and refill will reduce your CYA level to a point where your FC can be much closer to 4 ppm.

    Almost every manufacturer, of almost all pool equipment says to keep the FC below 3 or 4. I believe that they do this because they do not use CYA in their analysis. My understanding is that an FC of 4 without CYA is worse than an FC of 10 with a CYA of 90. Let's face it, if you can swim in it, how bad can it be for a machine?

    Thanks,

    Jim R.
    Finished in 2015 - 17K Gal, IG, 20' x 25' Almost Rectangular Pool, Pebble finish, three rockport water falls. Pentair Equipment: EasyTouch 4, IC40 SWG, 3 HP VS Pump, CCP520 Cartridge Filter.
    TF100 with SpeedStir and SampleSizer, ColorQ Pro 7, Dolphin Premier Robot Cleaner, added Screen Logic 2, added small 3 person Calder Spa.

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