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.