Imagine my when I pulled back the mesh cover and found stains. I've never had any metals in my water, and my house water (fill water) was tested YEARS ago and was negative for metals. However, the Vit C tablet test is positive. The only place that doesn't have stains is where the small (2ft diameter) circle of leaves were in the bottom of the pool. I don't see stains on the sides of the pool, just the bottom of vinyl liner and white steps. I don't have a water heater. The ONLY thing I did different this winter was I used a small pool cover pump as NC had a lot of rain and it allowed me to keep pool pump/filter off line (metal from the hose??? - yeah its a stretch).
I put pool pump/filter back online (6hrs/day) about 1-2 months ago when the pollen bloom was just beginning here in NC. Peaked under the cover and water clear, small area of leaves in deep end, dusty debris on bottom of liner throughout (did I mention I have a mesh winter cover?). Initial water readings: pH 7.4 CL 0; CYA 60 (first season I haven't lost CYA, I usually open late April to a green swamp). I've been adding 1/2 lg jug of bleach every 3-4 days and CL holding at 4-5ppm. Last Thursday mesh cover pulled off. What I thought was further "dusty debris" didn't brush off nor come off during cleaning w/ Aquabot. I initially thought it was tannin stains from leaves so increased CL to 15 and waited for sun and chlorine to work to resolve the stain. Didn't work. Then realized they are metal/iron stains. < >
Current water readings(mine......pool store)
pH: 7.2 7.8
FC (ran out of powder) 9
TC 10 (dilution method) 9
TA 70 75; 52 adjusted??
CH 140 134
CYA 60 69
The only significant discrepancy between our results is the pH finding. I'm trusting my readings.
So while I wait for my CL to go down, I picked up ascorbic acid from pool store (2 Natural Chemistry Stain Free - 1.75 lbs.) and their sequestrant Metal Free. At least they told me it was a sequestrant. Only difference in deliver system is product suggests adding Metal Free w/in one hour after Stain Free application. After 24 hrs, then vacuum. Most product reviewer note they didn't add sequestrant for 24 hrs. Sounds about right.
I am taking my fill water in for testing tomorrow to see if it has metal. All household surfaces do not show metal staining....calcium build up yes, but no staining. Curious.
Has anyone here used the Natural Chemistry Stain Free product??