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Okay, over the past day I've dissolved most of a sock full of CYA into the pool but am not seeing an appreciable increase in my CYA level - it still tests >30. I'm losing chlorine pretty rapidly during the day. Current test numbers: CYA: >30 FC: 2.5 CC: 0 pH: 7.4 TA: 70 CH: 210 What...

After adding a gallon of the 10% chlorine and letting the pump circulate it for a couple hours, FC now tests at 4.5. CC is still at or near zero (adding the R-0003 did not turn the sample pink but there may have been the barest hint of a color change from totally clear, so small as to leave me...

Okay, here are the numbers, tested with a Taylor FAS-DPD kit: At sunset last night: CYA: approx. 25 FC: 1.8 CC: 0.2 Did not test PH, TA, or CH This morning right after sunrise: CYA: approx. 25 FC: 1.0 CC: 0 PH: 7.2 TA: 60 CH: 220 So looks like a passing grade for the OCLT. CYA, FC...

Thanks for the response. Tonight I plan to check my CYA and also do an OCLT - with a real FAS-DPD kit, not just the cheapy strips. And I've got 24 gallons of Pool Essentials liquid chlorine on order from Lowe's, so if needed I'll start SLAMming ASAP. Thanks again, I'll post back with some...

Not sure where to begin... I have an older in-ground pool, vinyl liner (replaced in 2012, currently in good shape, I think). Pool is 45'x22', approximately 25,000 gallons. Filter is a Hayward EC65A DE model. We are located on the East Coast, near Baltimore. Weather has been alternately cool...