Mothers-in-Law are put on this Earth to keep us humble!
Do NOT put that stuff in your pool. You were fine and it all created problems. Pool care isn't magic, and there's really no guess-work about how to do it. It also doesn't have to be hard.
From your original post I'm guess you chlorinated with di-chlor powder or tri-chlor tablets. Mid-summer it goes green. Why? The powder and tabs add stabilizer far beyond what you need until the "standard" level of chlorine isn't high enough to kill algae--or sanitize your pool. Then the pool store plays "GOTCHA!" and takes multiple injections of $$$$. It's not hard to see what's happening. You need to figure out the B-B-B method and you will have a cleaner pool and spend a lot less time cleaning it up.
Over at Ben's other site, Poolsolutions.com, is this nice intro to the B-B-B method. It's really pretty simple:
http://poolsolutions.com/gd/the-BBB-...pool-care.html
Carl
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