Originally Posted by ellisz
experts know if the DI
filter is what removes the phosphates? I have a final carbon stage that is for taste. I do use this even though I don't need to. This would not cause any issues would it?
It most certainly can. All living things contain Phosphates. Trees were once living so therefore the activated Carbon contains Phosphates. The manufacturers of GAC
are now using acid to wash as much ash as possible out of the activated Carbon and that is a great help as the Phosphate level in Carbon has decreased substantially in recent years. However, it is not completely gone. That's why I recommend that people soak their Carbon in RO
water for several days before putting it into their tank. The RO
water acts as a magnet and sucks the Phosphate out of the carbon. If your final stage Carbon filter is AFTER your DI
cartridge, then this is what you might be experiencing.
One way to find out would be to take the carbon out of the last stage...make some RO
water without the carbon and test that. BTW
...the Phosphate leaching that occurs with Carbon is highest when the Carbon is brand new.