Quote:
Originally Posted by Keefelane66
His son had a lizard crawl up and die blocking water flow then and vacuumed drain out.. With proper maintenance annual/semi-annual treatments vinegar or chlorine water mixture should eliminate algae from forming a screen will not prevent this only ingress of bugs/lizards. A water trap will do the same.
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I agree. But, if the P-trap is located near the inside HVAC unit, you may have about 20 feet or so of empty pipe for animals to clog up the pipe. I don't have a P-trap or a screen, and I have never had a clogged drain. But, I do keep it flushed out.