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  1. E

    2-phosphono-1,2,4-butanetricarboxylic acid?

    I was hoping someone can answer my question. Before I went BBB the pool store told me to put 2 1/2 16 oz. Biogard Scale Inhibitor into my pool. My guess is because my CH was pretty high. My trusty TF-100 measured my CH after I put the scale inhibitor in at 630. The ingredient is...
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    Am I done shocking or should I continue?

    Hi. My background is here and here. I have now realized I have a filter problem which is probably why my water is still very cloudy. It looks clean but oh well until that filter is replaced there is nothing I can do about it. Here's the latest test results: FC: 10 CC: .5 TA: 100 PH: 7.4 CH: 580...
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    Filter question... I should probably know the answer but

    My sand filter is ancient. It's so old the multiport has only backwash, winterize, recirculate and filter. I understand the new ones now have six, rinse being one of them. My question is what is recirculate for? The reason I am asking is because the valve pin broke so to backwash we have to...
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    yet another "going on vacation" question

    I will be out of town starting early Friday and will be back late Monday. My FC is currently at 8 (still coming down from shock level). My CC is staying at .5. My CYA is <20. My question is should I bring my FC to shock level which is 10 and overcompensate on the days I will be gone? Like if I...
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    Has passed the overnight FC loss test for 3 days now BUT....

    This is a continuation from this thread Has passed the Overnight FC loss test for 3 days now with no visible change. Here's the latest from this morning: FC: 11 (no change from last night, has passed the overnight FC loss test for 3 nights in a row) CC: .5 pH: 7.8 TA: 90 CH: 630 (this was...
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    Has this ever happen to you?

    Last night as I was getting ready to test for FC and CC (I have the TF-100), I placed a heaping scoop of R-0870 using the tiny blue spoon to my 10ml pool water, the water didn't turn pink. It stayed clear. I thought there is something wrong because I tested a few hours before and it was above...
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    Ornery cloudy water

    Hi All, brand new here. I am someone who got a D in Chemistry in HS so please forgive me if I sound clueless. My husband and I recently moved into a house in Washington, DC with a pool with the following specs: 24K gal., white plaster, in ground/in door, sand filter, I have to get back to you...
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