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Thread: Question on CSI

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    Join Date
    Jun 2014
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    Question on CSI

    Can someone explain to me why there are 2 values for CSI in Pool math. When I enter my numbers the CSI has 2 values one which when hovered over says balanced the other says potentially hazardous. What gives which should I listen to and how would I go about getting it more in the "balanced zone" if this is a potential problem? My numbers are:
    FC 8.5
    PH 7.6
    TA 90
    CH 300
    CYA 50
    Borate 80

    Thank you
    Houston Texas area, 19,400 Gal., IG, Gunite, Pebble sheen pool with 1,273 gal. spa. Pentair equip.: Intelliflow variable speed pump (pool), Whisper flow 2.5 HP (6 scuppers), DE filter 60 Sq feet plus, Kreepy Krauly Prowler 830 robotic cleaner, Ultra pure ozonator 25k gal., Stenner pump with 15 gal tank (s1g45mfh7a2s) , 1.5 HP Silencer Blower, EZ touch controller system with Screen logic system. Installed 08/2014.

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    JasonLion's Avatar
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    Re: Question on CSI

    There are two columns of numbers, now and target. One CSI field reports on the numbers you have in the now column, and the other reports on the numbers you have in the target column.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    Re: Question on CSI

    Quote Originally Posted by RKnight View Post
    Can someone explain to me why there are 2 values for CSI in Pool math. When I enter my numbers the CSI has 2 values one which when hovered over says balanced the other says potentially hazardous. What gives which should I listen to and how would I go about getting it more in the "balanced zone" if this is a potential problem? My numbers are:
    FC 8.5
    PH 7.6
    TA 90
    CH 300
    CYA 50
    Borate 80

    Thank you
    Your numbers look good all the way down to 49 degrees F. After the temp drops below that it goes downhill without some sort of adjustment. PH seems to be the biggest factor in CSI. You didnt specify your water temperature which means a great deal.

    Like Jason says you put your results above into the left column and read the CSI in the left column. That is what you have now. In the right column you enter whatever numbers you want to adjust to and the calculator gives recommendations on what to add or do to achieve that. It also gives the CSI of what you entered in the right column so you can see what it will be if you do those adjustments.

    Enter your test results above in the left column then enter your test results in the right column except enter the pH of 7.8 and you will see the difference. Dont forget to put the water temperature. You just have to play around with the calculator if you want to see what happens when you do this or that.
    18,000 Gallon Aboveground. Sand Filter with 2HP 2 speed Pump.

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    Re: Question on CSI

    Thanks so much guys! That explains my confusion away perfectly! BTW water temp is now 59F so sounds good.

    Thanks again!
    Houston Texas area, 19,400 Gal., IG, Gunite, Pebble sheen pool with 1,273 gal. spa. Pentair equip.: Intelliflow variable speed pump (pool), Whisper flow 2.5 HP (6 scuppers), DE filter 60 Sq feet plus, Kreepy Krauly Prowler 830 robotic cleaner, Ultra pure ozonator 25k gal., Stenner pump with 15 gal tank (s1g45mfh7a2s) , 1.5 HP Silencer Blower, EZ touch controller system with Screen logic system. Installed 08/2014.

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    Re: Question on CSI

    The numbers seem to support letting your PH climb a little during the colder months. Is this a suggested practice?
    Houston Texas area, 19,400 Gal., IG, Gunite, Pebble sheen pool with 1,273 gal. spa. Pentair equip.: Intelliflow variable speed pump (pool), Whisper flow 2.5 HP (6 scuppers), DE filter 60 Sq feet plus, Kreepy Krauly Prowler 830 robotic cleaner, Ultra pure ozonator 25k gal., Stenner pump with 15 gal tank (s1g45mfh7a2s) , 1.5 HP Silencer Blower, EZ touch controller system with Screen logic system. Installed 08/2014.

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    JasonLion's Avatar
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    Re: Question on CSI

    PH will go up naturally as the temperature goes down, essentially canceling out the CSI change due to temperature. Because of that you don't normally need to do anything over the winter. The main exception is when you have recently applied plaster, which can sometimes drive up the PH too much.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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