Current test readings from my TF-100:
I opened my pool this year to pure green - quickly shocked and filtered 24/7 and now water is crystal clear.
I have some brownish staining in my deep end (along the ridges where it grades up towards the walls). I also have some very slight yellow discoloration along the pool bottom edges. Thinking they were organic, I followed SLAM method and passed OCLT. Staining remains, letting my FC drop to normal levels today.
I decided to bring my water to my local large pool store to have it tested for metals. 0 metals, phosphates around 200 (they said nothing to worry about, and it rained today.. who cares about phosphates anyway). The weird thing is that their testing mirrored the results from my TF-100, except PH which they measured at 8.2! The guy told me I was getting an inaccurate PH reading on my test-kit because my FC was so high (6.5.. not that high right?) and that their test will allow them to test PH at all FC levels, therefore accurate.
Came back home and tested PH again with two separate test kits.. both times 7.4. What the heck. Can I get false low PH readings with high FC? I thought I could only get false highs.
Anyway - I added some baking soda to get my TA up (hopefully just to 60). I know high PH can constribute to staining.. should I try some dry acid?
Thanks guys - this is a wonderful resource to pool owners!