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Thread: CYA down to 300!

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    CYA down to 300!

    I am new to pools and just bought a house with one. I had the water tested at 4 local pool stores. Results for CYA were between 90 and 400 depending on who you believe. I ordered a kit (Taylor 2006) and 400 was about right. I did a partial drain, but still way to high to measure with the test kit (dot disappears after 1/4" of test solution added). Results for FC were between 4 and 16. I think 16 was right. After two weeks of no SWG (turned it off, actually I just discovered it is shot so I am getting a new one) the FC is now about 10. Salt is now about 4,000. pH and alkalinity are good. Ca is now 1,200.

    The pool seems perfectly fine. Very clear. After being here a couple of weeks I think the pool has been like this for years. They did not do anything except add chlorine tablets, but is seems to work.

    Can I limp along this summer and drain the pool this winter? Getting too hot to drain it now. I could do a bunch of partial drains, but I am afraid of messing up the chemistry even more.

    Thoughts?, Ideas?, Charms and potions?

    Thanks
    13,000 gallon in ground salt water plaster pool and spa, Aqua Logic controller, Pentair 320 cartridge, intelliflo variable speed pump, Paramount in-floor cleaning system, MiniMax heater

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    Richard320's Avatar
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    Re: CYA down to 300!

    If CYA is 300, minimum FC for a SWG is 14, according to poolmath.

    Since the pH test is inaccurate above 10 FC, you will never ever know what your real pH is. Too low, expect burning eyes and irritated skin, crumbling plaster, and corrosion inside your heater. Too high, then expect burning eyes and irritated skin and grow-your-own sandpaper on the walls that will give you instant roadrash if you graze it with a knee or elbow.

    If you somehow get algae, you'll have to drain anyway, because there isn't a test kit made that can measure the chlorine levels you'd need.

    Through evaporation and refills, your CH is also going to get worse and worse. The grow-your own sandpaper scenario is almost a given.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
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    Re: CYA down to 300!

    Thoughts?, Ideas?, Charms and potions?
    Only solution is a series of partial drains other than reverse osmosis if available. Why limp when you can run! If that puppy gets algae you're gonna be in for a ride. Gonna be a lot of uneccesary wear and tear on that salt cell having to maintain FC that high.
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    Re: CYA down to 300!

    If I use a meter can I measure pH?

    Quote Originally Posted by Richard320 View Post
    If CYA is 300, minimum FC for a SWG is 14, according to poolmath.

    Since the pH test is inaccurate above 10 FC, you will never ever know what your real pH is. Too low, expect burning eyes and irritated skin, crumbling plaster, and corrosion inside your heater. Too high, then expect burning eyes and irritated skin and grow-your-own sandpaper on the walls that will give you instant roadrash if you graze it with a knee or elbow.

    If you somehow get algae, you'll have to drain anyway, because there isn't a test kit made that can measure the chlorine levels you'd need.

    Through evaporation and refills, your CH is also going to get worse and worse. The grow-your own sandpaper scenario is almost a given.
    - - - Updated - - -

    I was thinking of adding bleach so I do not have to run the salt sell so high. Will that work?


    Quote Originally Posted by woodyp View Post
    Only solution is a series of partial drains other than reverse osmosis if available. Why limp when you can run! If that puppy gets algae you're gonna be in for a ride. Gonna be a lot of uneccesary wear and tear on that salt cell having to maintain FC that high.
    13,000 gallon in ground salt water plaster pool and spa, Aqua Logic controller, Pentair 320 cartridge, intelliflo variable speed pump, Paramount in-floor cleaning system, MiniMax heater

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    Re: CYA down to 300!

    As to the bleach question. Yes, in fact, a number of us do just that rather than fiddle with the SWG% for things like pool parties and such.
    Bob - INTEX 12x24 owner (not setup yet), 'New to me' Kreepy Krauly Sand Shark, Test kit: TF-100 w/Speed Stir

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    Mod Squad jblizzle's Avatar
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    Re: CYA down to 300!

    With the very high cya I'm not sure that the swg would actually have to work any harder to maintain the high FC levels.
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    Re: CYA down to 300!

    Interesting. That does make sense.


    Quote Originally Posted by jblizzle View Post
    With the very high cya I'm not sure that the swg would actually have to work any harder to maintain the high FC levels.
    13,000 gallon in ground salt water plaster pool and spa, Aqua Logic controller, Pentair 320 cartridge, intelliflo variable speed pump, Paramount in-floor cleaning system, MiniMax heater

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    Re: CYA down to 300!

    Should I use an algaecide to be safe? If so, any particular type? I was going to put borate in once I get the CYA under control or would that be effective now?

    Quote Originally Posted by Richard320 View Post
    If CYA is 300, minimum FC for a SWG is 14, according to poolmath.

    Since the pH test is inaccurate above 10 FC, you will never ever know what your real pH is. Too low, expect burning eyes and irritated skin, crumbling plaster, and corrosion inside your heater. Too high, then expect burning eyes and irritated skin and grow-your-own sandpaper on the walls that will give you instant roadrash if you graze it with a knee or elbow.

    If you somehow get algae, you'll have to drain anyway, because there isn't a test kit made that can measure the chlorine levels you'd need.

    Through evaporation and refills, your CH is also going to get worse and worse. The grow-your own sandpaper scenario is almost a given.
    13,000 gallon in ground salt water plaster pool and spa, Aqua Logic controller, Pentair 320 cartridge, intelliflo variable speed pump, Paramount in-floor cleaning system, MiniMax heater

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    Richard320's Avatar
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    Re: CYA down to 300!

    Sorry, I have zero experience with borates, algaecides, or digital pH meters.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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    Re: CYA down to 300!

    Even if you manage to get by for a while, when would you plan on bringing the pool under control?

    All your call, but it sounds like you're attempting too many work-arounds. I would not encourage it.
    Dave S.
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    Re: CYA down to 300!

    Thanks. I am going to try several partial drains and see how far I can get.

    Quote Originally Posted by duraleigh View Post
    Even if you manage to get by for a while, when would you plan on bringing the pool under control?

    All your call, but it sounds like you're attempting too many work-arounds. I would not encourage it.
    13,000 gallon in ground salt water plaster pool and spa, Aqua Logic controller, Pentair 320 cartridge, intelliflo variable speed pump, Paramount in-floor cleaning system, MiniMax heater

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    Re: CYA down to 300!

    I would just go for it and drain 80%, your electric cost alone on partial drains and running your pump 24/7 if you get algae is just not worth it IMHO.

    Felipe
    7,500 gal Rectangular, Easytouch 8, Air+water temp sensors, Screenlogic2, IC40, intellibright5g color12v, Intelli pH, SD 70 filter w/Zeolit, Magicstream Laminars, waterfall. Raised Monolithic concrete lined with glass beads.

    In Sunny Monterrey,Mx!

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    Re: CYA down to 300!

    Flying Tivo,

    There is no extra electric cost in doing partial drains. There is no increased risk of algae, either.
    Dave S.
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    Re: CYA down to 300!

    Quote Originally Posted by duraleigh View Post
    Flying Tivo,

    There is no extra electric cost in doing partial drains. There is no increased risk of algae, either.
    Down here electric bills are high and more so in the summer, and water is so cheap that i would do that, but i did not take into account for his location. I did not mean increased risk of algae, but that if he gets algae then running the pumps for slam was going to impact the electric bill.

    Felipe
    7,500 gal Rectangular, Easytouch 8, Air+water temp sensors, Screenlogic2, IC40, intellibright5g color12v, Intelli pH, SD 70 filter w/Zeolit, Magicstream Laminars, waterfall. Raised Monolithic concrete lined with glass beads.

    In Sunny Monterrey,Mx!

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    Re: CYA down to 300!

    I pumped all night with a small pump and still pumping. Pumping at one end and recharging at the other end. Adding a dash of bleach every few hours. I just don't know my pool well enough to be more aggressive at this point. Hopefully I will get my chemistry levels low enough that I can actually measure them. My pH meter should arrive today. I will verify it works well in the presence of chlorine and use it for pH since I am keeping chlorine high for the moment.

    Thanks
    13,000 gallon in ground salt water plaster pool and spa, Aqua Logic controller, Pentair 320 cartridge, intelliflo variable speed pump, Paramount in-floor cleaning system, MiniMax heater

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    Re: CYA down to 300!

    I just read of another member having success with the 'tarp method'. You lay a large tarp over the surface of the pool and then drain from under it while filling above. As long as the tarp is big enough you can do a pretty decent job this way. There have been a number of members that show success with this method.
    Bob - INTEX 12x24 owner (not setup yet), 'New to me' Kreepy Krauly Sand Shark, Test kit: TF-100 w/Speed Stir

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    Re: CYA down to 300!

    Never thought of that. I am draining from the low point and filling on top at the shallow end. I figure the salt water will stay low and the fresh water will float so I should get minimal mixing.


    Quote Originally Posted by pabeader View Post
    I just read of another member having success with the 'tarp method'. You lay a large tarp over the surface of the pool and then drain from under it while filling above. As long as the tarp is big enough you can do a pretty decent job this way. There have been a number of members that show success with this method.
    13,000 gallon in ground salt water plaster pool and spa, Aqua Logic controller, Pentair 320 cartridge, intelliflo variable speed pump, Paramount in-floor cleaning system, MiniMax heater

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