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Thread: AZ partial drain for CYA; question about running filter

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    AZ partial drain for CYA; question about running filter

    My CYA was over 80 and then I used tabs instead of liquid chlorine for the winter, so it probably spiked.

    This afternoon I started a (slow 6gpm amazon pump) partial drain and now I'm realizing that it's 6pm and the water is nearly below the skimmer basket.

    My question is if I should I start refilling in time for the pump to run tonight or can I miss a night (water temp around 60 and FCL of 16, pH 7.4)? This might mean doing a second drain next weekend and the outside temperature is starting to climb quickly as it's March. Plus I don't want to waste water.

    A follow up for if I need to refill. Does the water need to be at the full level or is it fine to be just above the skimmer basket level?

    Thanks everyone!
    ~12,000 gallon IG pebble pool. Pentair CnC Plus 4-cartridge system, AO Smith 1.5hp single speed

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    Patrick_B's Avatar
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    Re: AZ partial drain for CYA; question about running filter

    If it is too low in the skimmer it will suck air, so not good. If it's a good bit lower than halfway the center of the skimmer mouth, that is risky. Can you reschedule the pump, or turn it off? Either way, you don't want to risk filling the pump with air.
    TFP Moderator
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    Re: AZ partial drain for CYA; question about running filter

    I can turn off the pump I just wasn't sure if that's okay for a night?
    ~12,000 gallon IG pebble pool. Pentair CnC Plus 4-cartridge system, AO Smith 1.5hp single speed

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    Mod Squad Jimrahbe's Avatar
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    Re: AZ partial drain for CYA; question about running filter

    Gig,

    I don't believe that one day of not running the pump with an FC of 16 and water temp in the 60's will be a problem.

    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 Caldera Spa.

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    Re: AZ partial drain for CYA; question about running filter

    Jim was correct my levels were fine a night without the filter.

    Unfortunately I'm on round two. I drained 17 hours (5100 gallons) and then let the new water mix and circulate for a week. Tested the CYA around 90 still, so i was worse off than expected.

    New question for round 2... It's now in the high 80s air temp in Phoenix. I need to drain for 24 hours based on needing to replace half my 12k gallon at 5gpm. Then 20+ hours to fully refill from the spigot. Do I have to worry about the pool raising out of the ground or anything like that?
    ~12,000 gallon IG pebble pool. Pentair CnC Plus 4-cartridge system, AO Smith 1.5hp single speed

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    Re: AZ partial drain for CYA; question about running filter

    In Phoenix, you usually don't have to be too concerned about the pool popping out of the ground as our water table is quite low.

    I know your intent is to lower the CYA, but how high is your CH? And what's the CH of your fill water? If your pool water CH is extremely high, you may need to drain more than you planned to get the CYA down.

    It might be better to rent a sump pump from Home Depot or buy one from harbor freight. Best to drain it fast - 6 GPM is awfully slow. And you'll save water by not having to do multiple small drains. Is it possible to use multiple hoses to refill?

    If you go with your present plan, it may be best to hose down the exposed pebble to keep it from getting too hot.
    Gene
    ​12,300 gal IG play pool - Pebbletec - built 10/1999 || Hayward S360SX 36" sand filter || Hayward Ecostar SP3400 VSP || A&A In-Floor cleaning system || Quik Water Leveler || Quik Dek-clor (limited use)
    TF-100 testkit / Speedstir - A good test kit is not an expense, it's an investment

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