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Thread: CH Test - Significant rise or just very light blue?

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    MattM's Avatar
    Join Date
    Jul 2011
    San Diego, CA

    CH Test - Significant rise or just very light blue?

    CH Test started at around 190 when pool was first filled in December, rose to ~280 within the first 60 days due to the plaster curing, and has mostly stayed between 270-320 from Feb - May. I saw some calcium scale building up on the SWG last month and lowered ph to counteract(-CSI). This solved that problem, but over the last two weeks when I've done the CH tests what I see is that right from the start the R11 solution turns the vial only very light green, and then the vial rapidly turns almost transparant with just a blue tinge at ~360 - if I keep adding drops, the water color only changes by the most tiny amount and is itsy bitsy more blue at ~450 (but still mostly still transparant).

    So, I'm wondering if my chems have gone bad, do I need to keep adding drops to see if the color changes further to finally something more blue, or which CH result should I trust 360/450/etc.

    I do note that we have quite a bit of evaporation with air temperatures in the 80's and water temperature held between 85-90 degrees. The autofill no doubt has had to add a bunch of water and our area has spikey tap water ch levels so I expect gradual increases in CH...360 seems believable..450+ would be a stretch.
    24K gallon inground gunite/pebble sheen pool, 34'x16' 4-7.5ft deep, 750sq ft solar, pentair ultratemp, intelliflow vs+, ic60, intellichem w/ acid pump, quad de 100, intellibright 5g, intellitouch i5-3s with Screenlogic2, 3" primary piping - 2.5" at equip pad, auto switched deep heating and main returns, automatic safety cover w/ electronic lock and embedded recessed undertrack, sealed stamped concrete deck, dolphin deluxe 5, started up December 2011.

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    Richard320's Avatar
    Join Date
    Jan 2010
    San Dimas, CA (LA County)

    Re: CH Test - Significant rise or just very light blue?

    You have bad R-0011L most likely. The sample should should turn pinkish when you add it. If yuou bought it from TFtestkits, contact Dave, he'll fix it. You're not the first one to report problems.

    As an aside, 450 is not a stretch - I've hit 1100 before. Just by refilling what's evaporated!
    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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