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 and rainy or moderately warm (70-80), breezy, and low humidity. I realize I may be premature in posting without hard test numbers and I apologize in advance for any breach in forum protocol.
Anyway... I'm losing quite a bit of water. Most of it seems to be evaporation, but not all. I've done the bucket test, and the bucket and pool lose about the same when the pump is not running, perhaps 1/4"-3/8" per day. With the pump running for 8 hours overnight I may lose an additional 1/8". Over the Father's Day weekend I lost about 1.5", give or take. So I suspect a leak in my buried return line but I wonder whether the additional loss when the pump is running could be accounted for by the increased evaporation rate caused by the agitation of the water (may be wishful thinking). For reference, I lost very little water while the pool was covered for the winter, maybe a couple inches, so I doubt I have a leak in my liner. The previous liner DID develop a nickel-sized hole in it and I lost almost all the water in the pool over that winter.
AND I'm losing free chlorine pretty rapidly, too. On Friday afternoon, prior to leaving town for the weekend, I added 9 lbs of shock (In The Swim normal shock, non-stabilized I believe). I did not test with FAS-DPD, just the quicky test strip, and FC was deep purple, indicating 20ppm or so. When I returned late last night the water was crystal clear but by this morning it had turned a bit cloudy and FC was back down to zero on the reagent test strip.
I think I have a handle on the procedure for SLAMming but I wonder whether it will be effective if I'm adding water a couple times a week? Or is that kind of FC loss normal? Thoughts, comments, suggestions? Thanks in advance.
Anyway... I'm losing quite a bit of water. Most of it seems to be evaporation, but not all. I've done the bucket test, and the bucket and pool lose about the same when the pump is not running, perhaps 1/4"-3/8" per day. With the pump running for 8 hours overnight I may lose an additional 1/8". Over the Father's Day weekend I lost about 1.5", give or take. So I suspect a leak in my buried return line but I wonder whether the additional loss when the pump is running could be accounted for by the increased evaporation rate caused by the agitation of the water (may be wishful thinking). For reference, I lost very little water while the pool was covered for the winter, maybe a couple inches, so I doubt I have a leak in my liner. The previous liner DID develop a nickel-sized hole in it and I lost almost all the water in the pool over that winter.
AND I'm losing free chlorine pretty rapidly, too. On Friday afternoon, prior to leaving town for the weekend, I added 9 lbs of shock (In The Swim normal shock, non-stabilized I believe). I did not test with FAS-DPD, just the quicky test strip, and FC was deep purple, indicating 20ppm or so. When I returned late last night the water was crystal clear but by this morning it had turned a bit cloudy and FC was back down to zero on the reagent test strip.
I think I have a handle on the procedure for SLAMming but I wonder whether it will be effective if I'm adding water a couple times a week? Or is that kind of FC loss normal? Thoughts, comments, suggestions? Thanks in advance.