The test kit that we favor here is the Taylor K-2006, which can be found online at http://www.amatoind.com/, http://www.spspools-spas.com/, or even better at http://www.amazon.com/gp/product/B00...SIN=B0002IXIIG (PF gets a contribution from them if it's ordered here). You can also get the same basic relabeled kit at Leslie's online stores. I know they're a little pricey, but I guarantee you the kit will save you hundreds of dollars just this summer alone (and they don't cost more than what you've already put into your pool!).

After adding the metal control, how does the water look? Can you tell any difference?

Janet