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We're currently using the 3" tabs, yes. What do I do now? 20k gal IG vinyl sand, variable speed pump TF-100, well

I finally got my TK-100 and did my first test this evening. Here are the results: TC: 5 TA: 180 CYA: about 55 pH was around 7.4 Water is crystal clear! Given these results, now what? 20k gal IG vinyl sand, variable speed pump TF-100, well

This is my first year with our new pool. We have a 18 x 36 20,000 gallon vinyl liner with a sand filter. We've had it professionally maintained all summer up until about a month ago and decided we could do it ourselves instead of paying $65/week. I feel very ignorant when it comes to all the...