Hi there! Just decided to get our pool, aka the cess pool, up and running this year. It sat unused and untouched, except for the ecosystem living inside of it and my kids hunting frogs and tadpoles, for 3 years. Had local pool guy come and suck out sludge from bottom. Worked on scooping for 3 weeks myself before hand, replaced skimmer box, pipes and fittings and pump filter box. Currently have a foot of water in bottom and have myself scraped sludge off sides and sprayed with 50/50 miratic acid n water in weed sprayer and scraped and scrubbed agian. Been quite a workout! Lol! Poured 2 gallons of liquid clorinator in today before stsrting acid scrub and stirred and water is no longer swamp like but becoming bluish! Over halfwsy done with acid wash on sides so i will finish tomarrow. Pool water comes Saturday and pool man comes back to hook up pump and show us the ins and outs and get everything going!