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Thread: Cyanuric Acid blues - draining pool

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    tlwilson's Avatar
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    Cyanuric Acid blues - draining pool

    I have tested several times and finally believe it. My pool's Cyanuric Acid level is between 85 and 100, so I am going to drain half my pool before the swimming season gets started here. I will also quit using Leslie's 3" pucks and start sanitizing with Chlorox. I have a submursible pump set on the bottom step. I'd like to drain even more out, thinking I need to remove most of the water in the shallow end to achieve a 50% reduction. Will it damage the vinyl liner to set the submrusible pump directly on the liner?
    24,000 Gal In Ground pool
    Vinyl Liner; Sand Filter
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    Re: Cyanuric Acid blues - draining pool

    Will it damage the vinyl liner to set the submrusible pump directly on the liner?
    Nearly impossible. I suppose there might be a circumstance under which the liner could be sucked up into the intake but that would be a phenomenal event.

    You could always submerge a couple of bricks to set the pump on if you wanted to be stunningly safe.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
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    Mod Squad Bama Rambler's Avatar
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    Re: Cyanuric Acid blues - draining pool

    It shouldn't hurt the liner as long as there are no sharp protrusions that will damage it.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
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    Re: Cyanuric Acid blues - draining pool

    Thanks for the quick replies!
    24,000 Gal In Ground pool
    Vinyl Liner; Sand Filter
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    Pentair IntelliChlor IC40 SWG
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    Re: Cyanuric Acid blues - draining pool

    I thought the recommendation was to leave at least a foot of water in the shallow end to ensure the liner does not shift. If you leave the pump on the step you are probably ok, but pay attention if you are going to drain more.

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    Jason, TFP Moderator
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    Re: Cyanuric Acid blues - draining pool

    Quote Originally Posted by tlwilson
    I have tested several times and finally believe it. My pool's Cyanuric Acid level is between 85 and 100, so I am going to drain half my pool before the swimming season gets started here. I will also quit using Leslie's 3" pucks and start sanitizing with Chlorox. I have a submursible pump set on the bottom step. I'd like to drain even more out, thinking I need to remove most of the water in the shallow end to achieve a 50% reduction. Will it damage the vinyl liner to set the submrusible pump directly on the liner?

    Cya of 85 to 100 is high, but not unmanageable. I'd leave it, and just stop adding more with pucks. It will slowly drop as the kids splash water out.
    13k gallon IG gunite pool
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    Re: Cyanuric Acid blues - draining pool

    Quote Originally Posted by texasdad
    Quote Originally Posted by tlwilson
    I have tested several times and finally believe it. My pool's Cyanuric Acid level is between 85 and 100, so I am going to drain half my pool before the swimming season gets started here. I will also quit using Leslie's 3" pucks and start sanitizing with Chlorox. I have a submursible pump set on the bottom step. I'd like to drain even more out, thinking I need to remove most of the water in the shallow end to achieve a 50% reduction. Will it damage the vinyl liner to set the submrusible pump directly on the liner?

    Cya of 85 to 100 is high, but not unmanageable. I'd leave it, and just stop adding more with pucks. It will slowly drop as the kids splash water out.
    Yep, this is what I did last year when I found TFP and quit my puck habit. It was at about 90/100, and it came down to 50 (before I got a pool plumbing leak and it went down to 10, LOL.)
    IG Plaster 20,000gal, attached spa w/ spillover, hayward C12002 cart filter, 1 1/2hp pump w/ polaris 360
    6/16/12 - PH 7.6, FC 6, CC 0, CYA 30, TA 80, Calcium 310

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    Re: Cyanuric Acid blues - draining pool

    Cya of 85 to 100 is high, but not unmanageable.
    The shock value for CYA of 100 approaches 40ppm. The maintenance FC values for CYA of 100 should be somewhere around 8-12ppm kept in the pool at all times.

    Anecdotal success of someone's pool who chose to live with that CYA value is often not good advice. It is very difficult for the average owner to maintain his FC that high and the forum discourages anyone to attempt it. Your pool water management becomes much easier when your CYA in a manually chlorinated pool is around 50ppm.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
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    Re: Cyanuric Acid blues - draining pool

    With 2 submursible pumps I reduced water by about 40% and then filled it back up overnight. I don't want to see my next water bill. Pool is full, filter pump is running and I'll look at my numbers tonight after work. With the filter pump running all day, is that enough time to get the water circulated enough for a good test tonight?
    24,000 Gal In Ground pool
    Vinyl Liner; Sand Filter
    Pentair Intelliflo pump
    Pentair IntelliChlor IC40 SWG
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    Re: Cyanuric Acid blues - draining pool

    Yes, your water should be circulated just fine. One word of caution, I hope your CYA is 50 or so but don't be overly discouraged if it is not. There are lots of reports on the forum of the drain and refill not yielding quite the reduction that it should. I can't explain exactly why although I suspect it is difficult to really drain as much as you should and most tend to drain a little less. Let's see how it turns out.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
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    Re: Cyanuric Acid blues - draining pool

    New numbers with 40% new water.
    FC 1.8
    CC 0.2
    pH 7.4
    Alk 125
    CH 250
    CYA 50

    Draining the pool was such a pain. I will never use a puck again!
    24,000 Gal In Ground pool
    Vinyl Liner; Sand Filter
    Pentair Intelliflo pump
    Pentair IntelliChlor IC40 SWG
    Raypak Gas Heater

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    Re: Cyanuric Acid blues - draining pool

    Draining the pool was such a pain.
    I hear ya' but your pool will soon be crystal clear and your maintenance is about to get easier.

    Those are very nice numbers on your latest test. Tell us what your water looks like?
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
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    Re: Cyanuric Acid blues - draining pool

    The water is so clear you could read a newspaper that is laying on the bottom of the deep end! Should I lower the Alkalinity since it is a little high?
    24,000 Gal In Ground pool
    Vinyl Liner; Sand Filter
    Pentair Intelliflo pump
    Pentair IntelliChlor IC40 SWG
    Raypak Gas Heater

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    Re: Cyanuric Acid blues - draining pool

    Should I lower the Alkalinity since it is a little high?
    You copuld but I wouldn't if it was my pool. Watch your pH. If it starts to go up, bring it down with acid and then lower the TA using the method described in Pool School.

    Now, raise your chlorine up a bit and keep it between 4-6ppm (per the CYA/FC chart in pool school) all the time and you will have a great swimming season. Very nice work!
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Mod Squad jblizzle's Avatar
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    Re: Cyanuric Acid blues - draining pool

    Quote Originally Posted by tlwilson
    The water is so clear you could read a newspaper that is laying on the bottom of the deep end!
    Well get it out of there before it clogs up your pump basket

    Nice work
    Jason, TFP Moderator
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    Re: Cyanuric Acid blues - draining pool

    Quote Originally Posted by jblizzle
    I thought the recommendation was to leave at least a foot of water in the shallow end to ensure the liner does not shift. If you leave the pump on the step you are probably ok, but pay attention if you are going to drain more.

    Posted with Tapatalk 2

    I agree with you, this isn't really an issue of will the vibrating pump damage the liner (it can, but unlikely) but you need at the very least 6 inches (that is cutting it very short) in the shallow end to hold everything in place, one foot should be a safe level.
    -Kevin
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    Re: Cyanuric Acid blues - draining pool

    Hi - I'm facing a similar issue to reduce CYA by draining off the water as the OP did. My calcs show I need to get rid of 50-60% of the water.

    My question is, by leaving a foot in the shallow end, how much water am I removing during a drain/refill process? Would seem that leaving the foot of depth in the shallow end would only be removing 30% tops of the total volume of a 16x32 rectangular? Of course this is just visualizing it in my mind. I'm sure I need to do the volume calculations to get this figured out.

    Thanks all.
    NJ
    16x32 Vinyl lined IG, 1 skimmer, 1 return, 2 seat jets, 19.5k gal, Hayward 4800 fiber clear filter, 1hp pump, heater and in-line chlorinator

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    Re: Cyanuric Acid blues - draining pool

    I've been reading this thread as well as others regarding the cyanuric acid curse. My pool has been in service for less than 1 year and the CYA level is already over 100. Not that many pucks have been used.. and the pool is big. I think the pool service company anticipated rain dilution over the winter, which didn't happen. Partly because I kept the pool covered and pumped the water off the cover and partly because there wasnt that much rain. So, I'll have to drain and refill. The water I must use is relativly clean, but not city or well water. It will contain some contaminants including some algae. The strategy is as follows.
    1. Shock the pool heavily
    2. Turn off all filtration after shock is complete
    3. Start adding new water at approx 20 GPM at the bottom of the deep end. Put a diffuser on the hose end to minimize mixing
    4. As the water rises, it will flow over the low dam wall and out the drain in the cover well.
    5. Because the incoming cold water is dense, it will stay on the bottom and the warmer water will flow out over the cover dam wall.
    6. In around 18 hours, about 50 percent of the water will be swapped, with some allowance for mixing
    7. Turn on filters, reshock and balance
    So, thats the plan. Any thoughts? Thanks.
    Frank, Northern Ca. 45,000 gallon 1 year old 20 x 50 inground, white plaster, Aqua Matic automatic cover, 525 sq foot cartridge filter, 1.5 hp variable speed Hayward Pump, Nature in line chlorinator, Polaris Pool Sweep with 3/4 hp aux. pump. 400,000 BTU Sta Rite propane heater. All equpment located below actual pool surface elevation

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    Mod Squad jblizzle's Avatar
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    Re: Cyanuric Acid blues - draining pool

    Sounds like an interesting plan ... although likely you should have started your own thread.
    Jason, TFP Moderator
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    Re: Cyanuric Acid blues - draining pool

    For what it's worth--concerning sub pumps sitting on liner earlier in thread.
    I've taken a 5 gal bucket, and drilled about 7 or 8 1 1/2" holes out of it near the bottom (on the sides of the pail). Set your pump inside the pail, and lower the pail in the pool with a rope. No chance of damaging liner, and easy in/out of the pool with the rope.
    24x54 Sharkline Matrix
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