Hello I've been reading the boards for a few years and have learned a lot. My pool is trouble free and looking great this summer thanks to everyone here.
Now I'm working on helping a friend who's pool is currently a green swamp. I tested with my taylor kit which reads
CC - 0.5
pH - 7.4
TA - 80
CH - 50
CYA - 0 (or at least too low to measure)
27, 000gal in ground vinyl liner no swg DE filter
First I backwashed the filter and added DE then I added 30ppm of dry CYA using the sock method and after several hrs when it turned to a soft sludge I slowly poured it into the skimmer. The pump is running continuously. I'm not too familiar with DE filters since I have a cartridge, but I then realized I can't shock or backwash now until all the CYA is dissolved. The filter is almost to the point where it needs to be backwashed again. So my question is, is 72 hrs long enough before I can backwash again and start shocking or do I have to wait a full week? I would like to start asap. Also I'm estimating that there will be between 30 & 40ppm of CYA now so I'm going to use a shock level of 14ppm or should I wait a full week retest CYA and then backwash and start shocking? Any tips would be greatly appreciated. Thanks.