Chlorine/CYA Shock chart question

[cood60]

Can I assume that if I have had and defeated the yellow Mstrd Algae, that I should now keep my FC at the appropriate Yel/Mstrd Min (7.5) from now on?
Not sure which column on the chart is appropriate for my situation
Also at what FC level does the PH test become invalid,

FC 13 (coming down from shock process)
PH 7.4 (was wild during shock so not sure this is accurate?)
TA 60
CH 70
CYA 50
Water is 88 degrees
Salt is 2900

 

[Richard320]

If the algae dead and gone, you just need to maintain a minimum of 3 FC for your 50 CYA. Chart With the SWG, you ought to raise CYA to 70ish. I'd be darn sure you're done with the SLAM before raising CYA, though.

The pH test gets iffy above 10 FC.
http://www.troublefreepool.com/threads/58834-Accurate-pH-test-during-shock-levels-with-R-007

The captions didn't make the transfer to the new server somehow.... the pictures are the same water sample. The first is normal. The second is just with high FC, the third is high FC neutralized with R-007 Thiosulfate chlorine neutralizer.