I just started to harvest rainwater in August. I have 2) 550 gallon Norwesco tanks. I'm cleaning this water with, Leafeater, 1st flush, sediment trapper filter 30 micron, 2 stage whole house system sediment filter 5 micron and CTO Carbon filter 5 micron, and lastly a 12GPM UV whole house water purifier sterilizer. Water test shows: Total Hardness 0, Total Chlorine 0, Alkalinity 40 ppm, pH 6.0, Nitrite safe, Nitrate safe, Copper 0.3 ppm, Iron 0.0 ppm, Pesticide Neg, Lead Neg. No Coliform Bacteria.
The water still has a slight color to it. Very pale straw color. Any ideas what it could be? Am I missing a certain type filter?