I have dark areas all over the pool (the majority of the pool, ranging from greenish brown to black)--they start about a foot down from the top edge in the shallow end, a couple of feet down from the¬*top¬*in the deep end, and then randomly on the floor, stairs, and steps in the deep end. It doesn't go away with brushing (I have a wall whale, so I'm getting lots of pressure).¬* It doesn't feel like anything (ie, it doesn't feel slimy). ¬*Is it safe to assume that it's staining from¬*metal-based products in the past or some sort of treatment that was applied to the Pebble Tec?¬* How can I be sure?¬* Is there anything else it could be?¬* Do I need to get a professional to come out and look at it?¬* I just want to be sure that it's safe to go in there once the test results are in range.
Here's the history in brief:¬* I have been fighting algae since I bought the house in December (never been swimming in it ).¬* Gave up for awhile and let the frogs live in my backyard swamp.¬* Finally found this site and am getting it cleared.¬* Currently, it looks pretty clear until I brush (which I am doing 1-2x per day).¬* I am maintaining at shock level (consistently since I got my test kit on Monday) because I am assuming that the cloudy stuff I am brushing is dead algae.¬* The pump has been running 24/7 for about 2 weeks.¬* The pressure is only about 2 over starting pressure.¬* I drained a couple of feet this weekend because the last pool store test results showed I had a CYA of 100-141.¬* I switched from pucks and cal-hypo about 1 1/2 weeks ago and now am only using 6% bleach.
With my Taylor k-2006,
FC: 13.5 last night, added 50 oz 6% bleach to bring up to 15*. Did NOT test 30 min after adding chemicals.¬* This morning before the sun hit it,¬*FC was 15.¬* I added 142 oz of bleach to make sure that it stayed at shock level throughout the day, but still below "high shock" of 24.¬* I will perform the overnight FC loss test tonight/tomorrow if possible (actually, is there any point in doing that if I'm still getting cloudy stuff off the bottom and sides when I brush?).
CC: < or = .5 this morning
*Note: I am having some issues estimating the volume of my pool--I had been assuming it was 17,000, now I am assuming it is 16,000.¬* It's an irregular shape, so I took several measurements and used¬*the¬*TFP's¬*Pool Calculator to get the 17k, but the first couple of times I used the test kit, I was getting higher FC numbers than expected (specifically, the FC was at 10, I added 192oz, which should have brought it up to 15.5, but it was at least 17 when I tested an hour later).¬* I'm still a newb with my test kit, which arrived on Monday, so the discrepancy may be due to my inexperience and not incorrect assumptions about the pool size.