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Thread: Any emphasize on CSI ?

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    Join Date
    Jun 2015
    Location
    Glendale, AZ
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    156

    Any emphasize on CSI ?

    I am new wanting to learn and in my mind I have many questions.....any emphasize on CSI ?....as I have a slight positive CSI of .13 should I shoot for a slight negative CSI with the newer plaster?

    I have a tendency to balance my water looking at the CSI number I am getting.

    I have new plaster from Feb/March this year, I keep high FC because of the high CYA (will drain this winter), I am using about 2 ppm FC daily, my pH drifts up about .2 - .3 ppm daily and adding MA to try to keep pH at 7.4 - 7.6....adding about 2 - 3 lbs of backing soda weekly to keep the TA 75-85

    Last Test
    FC 14.5
    CC 0.0
    pH 7.8
    TA 85
    CH 325
    CYA 120
    CSI .13
    Water Temp 90
    Valley of the Sun, Arizona.....10k gunite/pebble (Re-surface March 2015) w/in floor Caretaker 99 cleaning heads -- Pentair FNS 60 DE filter -- Pentair IntelliFlo Variable Speed for pool -- Pentair Wisperflo 1 HP for boulder waterfall...Taylor K-2006 & Taylor K-2006C kits

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    Richard320's Avatar
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    Jan 2010
    Location
    San Dimas, CA (LA County)
    Posts
    18,768

    Re: Any emphasize on CSI ?

    I see a big problem. If your FC is above 10, your pH reading may be reading falsely high. Look atr the pictures and check out the captions: Accurate pH test during shock levels with R-007?

    You might actually be lowering pH and therefore CSI too low which could actually be etching your plaster. At bare minimum shortening its lifespan.

    Your CH level is low enough that CSI isn't going to be too much of a worry. When CH heads north 0f 600, then it is a consideration. Your potentially low pH is more of a worry. It can etch plaster and corrode metal components in the filter and heater and possibly in the pop-up controller.

    I wouldn't wait to replace water to take CYA down to 90ish at least. Then target FC will be 9 or so and minimum around 7 and you'll know your pH test will be accurate.
    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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    duraleigh's Avatar
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    Apr 2007
    Location
    Sebring, Florida
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    Re: Any emphasize on CSI ?

    My philosophy is really very simple and is applicable to 99% of the pools in the US.

    Keep your parameters within the guidelines suggested here on TFP and ignore CSI.

    You can overthink it a lot more than that if that is interesting but you will lose out on swim time and adult beverage time.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  4. Back To Top    #4

    Join Date
    Jun 2015
    Location
    Glendale, AZ
    Posts
    156

    Re: Any emphasize on CSI ?

    Quote Originally Posted by Richard320 View Post
    I see a big problem. If your FC is above 10, your pH reading may be reading falsely high. Look atr the pictures and check out the captions: Accurate pH test during shock levels with R-007?
    I let the FC level get to 10.0 or under for a very brief time to check the pH accurately....then bump the FC, as I have checked FC and know almost to the hour... I know how much FC I am using and when to do the pH test, also how much the pH drifts higher......I am retired and live by the pool.

    Also I don't plan to drain for CYA until at least November.....you don't want to be draining pools when it is 110 degrees, I can live with testing/nursing all the time until then.

    - - - Updated - - -

    Quote Originally Posted by duraleigh View Post
    My philosophy is really very simple and is applicable to 99% of the pools in the US.

    Keep your parameters within the guidelines suggested here on TFP and ignore CSI.

    You can overthink it a lot more than that if that is interesting but you will lose out on swim time and adult beverage time.
    Thanks, I will do that...
    Valley of the Sun, Arizona.....10k gunite/pebble (Re-surface March 2015) w/in floor Caretaker 99 cleaning heads -- Pentair FNS 60 DE filter -- Pentair IntelliFlo Variable Speed for pool -- Pentair Wisperflo 1 HP for boulder waterfall...Taylor K-2006 & Taylor K-2006C kits

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