Swimming Pool & Spa Construction & Maintenance/back pressure when turning off pump
Expert: Ron Parrs - 7/29/2014
Question I have a 20X50 in ground rectangular concrete pool, 9 ft deep with a salt chlorinator. Two skimmers and one doesn't seem to have as much suction as normal. When I turn the normal one off at the valve, it pulls water but only half as much as it used to. When I turn the pump off there is back pressure and water actually blows the skimmer lid off of the one that works normal. Is the other line partially stopped up or is there another problem? I live in Oklahoma. Water is crystal clear and does not seem to be loosing water. Pump system and sand filter are on their 2nd season but the pool is about 15 years old with PVC pipe (as far as I know).
Answer Hi David,
Thanks for your question.
It sounds as if the filter is getting some air into the skimmer that is not pulling. Your problem could be more in the valve as opposed to the skimmer itself. What you describe as the lid blowing off is really common when excess air is present in that particular line.
If that particular skimmer that is giving you trouble is further away from the pump, it will naturally draw less water (closer to the pump = more action/flow, further from pump = less action/flow).
I would recommend operating the pool with just the troublesome skimmer only for a couple of days to see what happens... It's going to be a matter of trial & error.
I'm sorry that I can't be more helpful. Let me know.
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Thanks for the information on this problem i have..
Swimming Pool & Spa/Hot tub care. Water chemistry. Problem solving. Residential pools, vinyl liner a specialty. Limited knowledge of gunite or plaster pool construction. Familiar with almost all types of sanitizing systems whether chlorine, bromine, salt, low & non-chlorine chemical treatment, biguanide (Baquacil or Soft Swim), Nature2, etc. Experience treating bio films in pools and spas. Aqua finesse, PoolNaturally & SpaNaturally (using sphagnum moss to control pool & hot tub chemistry & bio-films).
Pool & spa care experience for over 37 years. Owner of Par Pool & Spa in Stratford, CT. Websites: www.parpools.com , www.spacareonline.com , www.pool-care.net , www.parpoolsblog.com
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Education/Credentials BS Accounting, University of Bridgeport, almost yearly participation in BioGuard Pool Schools, BioGuard University, Chem Plus Schools, Chem College attendance since 1981
Awards and Honors Past President - Connecticut Spa & Pool Association, Past Board Member - Northeast Spa & Pool Association