It's been a while since I've posted as we've usually had good luck with the TFP methods for the last 7yrs.. This year we have been at it for 4 weeks or more now and at a near total standstill for a week or more. I work 12hr shifts so getting started it always hard as there are days that I can't retest/maintain. Usually once I have several days off in a row things start coming together but not this year. The water is still cloudy enough that we can barely see the pattern on the bottom of the pool. Last week we let the chlorine drop to 4 (not intentionally.. I just had to work a couple of days in a row) and rebalanced the ph/alk/cya. A couple days later, on Friday we decided to open up the sand filter and give it a wash out as we couldn't remember the last time we did it (probably at least 3yrs). It was, of course, terrible. We washed and washed until all the 'cloudiness' was gone from it but there were still little 'bits and pieces' but WAY less than before. We saw a slight improvement the next day (maybe??) but nothing since. We've run the filter 24/7 for a month or more. We've vacuumed and brushed a million times. I'm almost out of test kit supplies and I'm completely out of CYA testing chemicals so going off my last test plus some strips to give me a general idea (if it looks like 30 I always assume it's 40 to be on the safe side when going to the fc/cya chart). We are still losing more than 1 at night and hard to keep level maintained during the day. My gut tells me we need to change out the sand. Here are this morning's numbers...
pH 7.5
alk 70
FC 13
CC 1.5
cya 40
Thoughts before I fill it with concrete????
pH 7.5
alk 70
FC 13
CC 1.5
cya 40
Thoughts before I fill it with concrete????