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FL1 code flashing. Circulation pump works well and flow valve opens and closes as it should. Pump 1 (2 speed) hums but doesn't move water. It's not seized. Troubleshooting yielded no results. Called tech and he recommended new board and replace pump for $1200. Ouch! Obviously I'm looking...

Good morning, I received my 2 gallons of muratic acid. It appears to be a construction grade, designed for cleaning tiles. There is nothing on it about pool use or % or active ingredients. Is this going to be ok to lower my pH? I don't want to add anything without checking with the experts...

Good morning, I clean and disinfect 2 hot tubs. We use bromine. When draining/refilling or topping off we use non-chlorinated water. Today, I used a chlorinated water source (<1ppm) and the water turned amber... almost yellow, but more golden. Is this what happens when chlorine and bromine...

Aloha, Crystal clear pool!!! Thanks experts. CYA 40, FC 4-6. Easy to maintain. Haven't added anything since the water replacement. No nothing, but calhypo tabs. pH has been in the 7.4-7.5 range. CH 250. TA 50. Seems low, so I add 40# baking soda (over 4 days). Now TA 80, but pH has...

Good morning, Is this the right stuff? Amazon.com : Robelle 4024 D.E./Diatomaceous Earth Powder for Swimming Pools, 24-Pound : Pool Supplies Chemicals : Home Improvement Does anyone know where I can purchase the right stuff but in smaller quantities? Thank you, Mike

Good morning, When (if) I get my cya down to 50ish, I want to experiment with this process. I can get a 53 gallon drum of 12.5% liquid chlorine for $193. It doesn't come with a dispenser, so I'll have to rig something. Any ideas are welcome. The state laws don't restrict hand feeding. This...

Good morning experts, Everything I've ever read ( on the side of bottles, mainly ) advises to not re-enter pool if the chlorine levels exceed 5 ppm. Yet the cya chart advises a fc level of 7.0 with a cya level of 60. What to do? Thanks, Mike

The articles in pool school reference residential pools. Do the same rules apply to commercial pools? We are open 24/7 and I'd love to convert to this method of care. I'm just concerned about the disclaimer. Also, is there a sub-forum on this site dedicated to commercial pool care? Thanks, Mike

Good Morning, Cloudy water, high chlorine use, read pool school, tested cya (off the map high), diluted pool water over past week, pool clear, fc still zero, cya (with 50% diluted sample) 200.... oh yeah, cannot close pool to slam. Stopped using stabilized pucks and have been adding 65%...