After pulling strings of plastic from pump screen multiple times I decided that the techs that drilled tank left debris inside tank.
I drilled 4 1/2 holes in tank and vacuumed out tank. I noticed that there was a fine layer of slime even after bleaching tank a few times a year. Now I am able to reach in and scrub tank inside and completely allow tank to dry while not in use. These are the parts I used and just used silicone to hold them in.
https://www.jonesstephens.com/produc...al-drain-bases
https://www.amazon.com/LASCO-33-3294..._t3_B000LBQPEI
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