Bear with me, as I'm sort of flying blind as I wait for my Taylor K2006 kit to arrive.
Here is the recent history of our 17,000 gallon, black plaster pool, cartridge filter:
It was green and terrible (after months of neglect) and my husband and I went to Leslie's with our sample a couple of weeks ago to fix it. After a week of shocking, it was still green and we had spent quite a bit of money. Oh, and they had us add 2.5 pounds of CYA. I did some research (boy, I really wish I had done this earlier) bought a cheap test kit from Walmart and added 6% bleach. Lots of it.
Our chlorine levels were seeming to hold (5+ on the OTO, strong 10 on the dip strips) but our pool, while blue, is cloudy. I can barely see the second step in the shallow end. I checked the chlorine this evening and it had dropped to 3, so I added bleach (6.4 gallons) to get it up to 20 ppm.
The numbers which I know are:
FC: (hopefully at 20 at this point)
CYA: 70 (ugh!)
The pump has been running 24/7, I have a sock in the skimmer, running our Polaris 380, and brushing the pool at least once a day. Have changed and cleaned the cartridge a couple of times this week. I haven't vacuumed to waste because we don't know how to do it. I took a look at the pumps and can't figure out how to get it to drain. Another mistake we made was putting some scented bleach in the pool. Most of what has gone in has been unscented 6%, but my husband bought some of the bad stuff and poured it in. I didn't catch the mistake until he had put in 4 x 96 oz of the stuff in there. I'm thinking this may be part of the reason that the pool isn't clearing. I have a bottle of Floc, but haven't added it at this point. I'd rather get the pool to clear with bleach.