Please, no apologies needed. I'm just grateful that you all are here and are responding. I'm getting more info from this site than I've gotten during the last 3 years searching other sites and talking with sales people at the pool stores. I should also say the information here is quite helpful too. If I use this product I will be sure to share my results. I also got some great products to try from my first post I made yesterday about metal products.

I have used a pre-filter before. It's called EcoOne Pre-filter and it claims to dissolve heavy Metals, Lime, Scale, Organic Contaminants among other things. The filter itself should have been good for two pool fills. I had a smaller pool last year ...less than 4000 gallons and it was supposed to be good for up to 8000. You attach it to the end of the garden hose. Big waste of money for me. First time chlorine hit my pool water got the green then the brown.