I opened my pool last weekend and proceeded to turn my nice blue water into a brown mess when I added my Walmart bleach. I have never had this trouble before when I topped off the water from my well, but I know it’s always a risk when using well water. I ran my sand filter that contains ZeoBright and threw some clean white shop towels into the pool to give the iron a place to go and after 24 hours my brown water was gone. I was however left with a shiny clear green water. During the process I backwashed the filter every 2 hours and I was surprised at how much coffee colored water came out each time. I also rung out the towels and placed them back into the water. My point to this is that I was clearly removing the iron from my water; the proof was in the backwash. Late yesterday afternoon I added 64 oz of HTH Metal Control from Walmart which shows its active ingredient as Hydroxyethylidene Diphosphonic Acid. Within two hours, my water was back to crystal blue. My question is this, I realize that these chemicals do not remove the iron, my filter and towels were doing that as evidenced by the backwash and rusty towels. Am I still removing iron from my water now that I can’t see it?

I don’t have the numbers from a water test as my Taylor kit is scheduled to arrive this week. My Walmart kit shows my CL at a near nuclear level (I over did the shocking) and my Ph is around 7.4.

Thanks.