Hello, everyone. I just love this site and have been trying to read as much as I can to educate myself. So, now to the issues. New IG pool put in last summer and filled on 7/14 2010. No issues balancing water last summer. Maybe it's a case of ignorance is bliss? Have an SWG (not turned on yet this season), Color Quartz plaster. This winter we had some trouble with the pool filling up after heavy rain even though we have a solid safety cover. Lots of dirt got in, had to drain it a couple of times. When we opened the pool on 4/19 the water was brown and cloudy as we expected. Started shocking and getting it balanced. I do have the TF-100 test kit (love it).
I got an original set of #s and thought my CYA was 50. Shock level according to pool school would be 28. Maintained this until yesterday (as i was losing FC overnight >1 but no CC's) when I decided to retest CYA and I got 0. Had a hard time with this and redid it 2 more times and I'm pretty confident it's 0. Took it to local pool store to see what #'s they'd get:
pH- 7.2, 7.4
FC- 14, 3
TC- 14, not noted
CYA- 0, not done (said wouldn't be accurate until water temps are in 70's) water temp 62.
CH- 325- 175
TA- 60, 50
Can't believe how off the FC level is. I believe mine. Redid it when I got home. Now the questions. I have a lot of rough patches on the walls of the pool. Also have light brown discoloration on sunshelf in the area where I think the water went under the cover. Are the rough patches and brown patches related. I'm thinking the brownish areas are organics from the dirty water. The rough patches I don't know. Maybe leeching of calcium from the plaster???