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Thread: Pool 6 months old - readings

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    surferbum's Avatar
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    Pool 6 months old - readings

    I have a 6 month old shotcrete pool and have been doing all my own maintenance after the PB initial startup. Water has stayed clear and no problems to report.

    The water here in Scottsdale is pretty hard (250-300ppm).

    Latest test results:
    • FC - 5 is target
    • TA - 100-110
    • CH - 400
    • CYA - 35
    • pH - 7.8

    The pH stays solidly at 7.8. About once a month I lower the pH to 7.2 and aerate with water features to gradually reduce the TA. It lowers TA 10-15 ppm and the pH rises (and stops) always around 7.8.

    Two questions:
    1. To lowering the CH much (by replacing water) is tough here in Scottsdale. Should I worry about it?
    2. Any issues if my pool stays at these readings?



    Thanks.
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    Re: Pool 6 months old - readings

    The only way to lower CH there is with fresh rain water or looking into the osmosis which can be expensive. Your CH isn't bad but you should try and keep your pH down around 7.2 so that it doesn't start clouding or causing problems with your CH if you have to refill with your tap and the CH goes up. Also, you need to raise your CYA to the very least 50 in that hot Arizona Sun.
    I'd bet you my bikini you'll never get TFP water from a pool store!

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    Re: Pool 6 months old - readings

    Quote Originally Posted by surferbum View Post
    I have a 6 month old shotcrete pool and have been doing all my own maintenance after the PB initial startup. Water has stayed clear and no problems to report.

    The water here in Scottsdale is pretty hard (250-300ppm).

    Latest test results:
    • FC - 5 is target
    • TA - 100-110
    • CH - 400
    • CYA - 35
    • pH - 7.8

    The pH stays solidly at 7.8. About once a month I lower the pH to 7.2 and aerate with water features to gradually reduce the TA. It lowers TA 10-15 ppm and the pH rises (and stops) always around 7.8.

    Two questions:
    1. To lowering the CH much (by replacing water) is tough here in Scottsdale. Should I worry about it?
    2. Any issues if my pool stays at these readings?

    Thanks.
    Currently, not at all with the CH. It's toward to higher side, but 400 CH is easily manageable. Depending on how much CH your fill water has determines how fast that increases in you pool.

    Keep an eye on it, along with managing your pH carefully and not letting it get high (above 7.6) if you can help it. I prefer a little safety factor and would want this to be my high limit. Certainly don't let it remain above 7.8.

    TA is a little high, but I imagine your fill water has a lot, so it will keep you on a course of faster rising pH when you have this situation. Just watch the pH and keep it in line.
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    Re: Pool 6 months old - readings

    Any issues if my pool stays at these readings?
    Nothing earth-shaking. Casey's advice to raise CYA to 60 is the most important change I would nake. Next, keep a pretty close eye on CH and pH but you seem to be doing that just right already.

    What's the CH of your fill water?
    Dave S.
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    Re: Pool 6 months old - readings

    Quote Originally Posted by surferbum View Post
    The water here in Scottsdale is pretty hard (250-300ppm).
    Quote Originally Posted by duraleigh View Post
    What's the CH of your fill water?
    It is.
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    Re: Pool 6 months old - readings

    Sorry I missed that CH. I would suggest that you are in pretty good shape other than the suggestions above.
    Dave S.
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    Re: Pool 6 months old - readings

    Quote Originally Posted by Casey View Post
    you need to raise your CYA to the very least 50 in that hot Arizona Sun.
    I'll make that my goal.
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    Re: Pool 6 months old - readings

    I hired a neighbor's pool service for my pool while I was out of town for 3 weeks. When I tested the pool when I returned there were some readings which are outside the range recommended here (in parenthesis). Should I take any action to change these readings?

    pH (7.5-7.8) 7.5
    TA (70-90+) 50
    CYA (30-50) 70
    CH (250-350) 400 [our tap water is 350]
    Shotcrete, Pebble Sheen Aqua Blue interior finish
    Pentair EasyTouch with wireless, IntelliFlo VS+ SVRS pump
    Paramount PV3 infloor cleaner & MDX3 drain, Heliocol solar heating
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    surferbum's Avatar
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    Re: Pool 6 months old - readings

    Quote Originally Posted by surferbum View Post
    I hired a neighbor's pool service for my pool while I was out of town for 3 weeks. When I tested the pool when I returned there were some readings which are outside the range recommended here (in parenthesis). Should I take any action to change these readings?

    pH (7.5-7.8) 7.5
    TA (70-90+) 50
    CYA (30-50) 70
    CH (250-350) 400 [our tap water is 350]
    Don't know if this was seen since website problems.
    Shotcrete, Pebble Sheen Aqua Blue interior finish
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    Re: Pool 6 months old - readings

    looks like they just threw in some tabs while you were gone? or had you raised the CYA before you left?
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    Re: Pool 6 months old - readings

    My pH always seems to go to 7.8 and stay there. I add acid and it temporarily goes to 7.2/7.3 but moves back to 7.8. Not too worried about it hanging around 7.7/7.8. Anyone have similar situation and remedies?
    Shotcrete, Pebble Sheen Aqua Blue interior finish
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    Re: Pool 6 months old - readings

    That is normal and not a problem. A higher TA or a lower pH causes more carbon dioxide outgassing and that has the pH rise faster. Stop trying to lower the pH so much, certainly not below 7.5. If it's fairly stable at 7.8, then leave it there. If your TA or CH are high and you are worried about calcium carbonate scaling, you can lower your TA instead. If you venture close to or beyond the edges of the Recommended Levels, then you can calculate the CSI in PoolMath to see if it's too high.

    The only risk of a high pH (with other levels balanced accordingly to not have the CSI too high) is metal staining. If you don't have metals in your water, then this isn't a problem.
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
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    Re: Pool 6 months old - readings

    Quote Originally Posted by chem geek View Post
    That is normal and not a problem.

    If it's fairly stable at 7.8, then leave it there.

    If you don't have metals in your water, then this isn't a problem.
    Thanks.
    Shotcrete, Pebble Sheen Aqua Blue interior finish
    Pentair EasyTouch with wireless, IntelliFlo VS+ SVRS pump
    Paramount PV3 infloor cleaner & MDX3 drain, Heliocol solar heating
    Perimeter 94', 13866 gallons, Max. dimensions 33' x 14, depth 3'6"-5'0", Baja entry & knife-edge end.

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