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Old 10-14-2021, 10:16 AM   #21
Join Date: Jan 2017
Location: Needville/Rosenberg
Hunt In: Eldorado and Victoria

I have had the same issue a couple of times. The A/C drain line attaches to the side of the P-trap. Mine is a rubber hose line that has a hose clamp that secures the rubber hose to the side of the P-trap. I have to loosen the hose clamp and remove the rubber hose. Once this is done then remove the P-trap and then clog will be clearly obvious at the area where the A/C drain line feeds into the P-trap and will be clogged with algae. Clean the algae out to clear the clog and reinstall everything in reverse order and you will be good to go. If you want to try something to prevent disassembly of the P-trap, pour about a half a gallon of bleach in the PVC line in your attic near A/C that feeds from the overflow pan to the sink drain. This may clear the algae but if it is clogged too bad you will have to do the disassembly as described above. Very simple to diassemble and reassemble and ensures all the algae is cleared out and will not damage any components of the system.
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