Here is a picture of the micron sleeve prefilter on my RO/DI unit. The cartridge on the left is the one in question. About an hour before this picture was taken I inserted a new filter into the chamber and ran water through the unit for the first time since moving here to Wisconsin. When I placed the filter in the machine it was as white as the carbon cartridge (plastic bottle) to the right in the picture. That lovely color was filtered in only one hour and about 5 gallons of RO/DI.
I am wondering if I need to add another prefilter to the unit. I cannot imagine what this will look like after 1000 gallons. I am worried that I will not even get 100 gallons out of the prefilter! The water coming through the unit tests ok. Conductivity is reading 8 mS (the tap water is 1350 mS), which is 99.6% efficient. Not bad for a 3 year old membrane. Waste water : ro water ratio = 3.15:1 at a psi of 40. I will probably get a booster pump to take the psi up to 70+ and try to improve the ratio. The pH is lower than it should be, but I am using water coming through the water softener. I will bypass the water softener tonight and see what the differences are. I cannot test the KH until tomorrow.
I am wondering if I need to add another prefilter to the unit. I cannot imagine what this will look like after 1000 gallons. I am worried that I will not even get 100 gallons out of the prefilter! The water coming through the unit tests ok. Conductivity is reading 8 mS (the tap water is 1350 mS), which is 99.6% efficient. Not bad for a 3 year old membrane. Waste water : ro water ratio = 3.15:1 at a psi of 40. I will probably get a booster pump to take the psi up to 70+ and try to improve the ratio. The pH is lower than it should be, but I am using water coming through the water softener. I will bypass the water softener tonight and see what the differences are. I cannot test the KH until tomorrow.
