Phosphates again!!

I must reply about the use of an Aquarium Phar. TAP WATER
PURIFIER to remove anything from water. While I won't get
into the quality of the output water I will talk about
quantity and cost. I own a TWP and hate it. If I get 20 gal.
out of it I'm lucky. I have talked to several others with
the same problem. The guy at Aquar. Phar. said he knows of
people who only get 10 gal. out. At $15 for a refill, I feel
it to be a big rip off. In the long run a RO/DI system is
much cheaper, and probably better. By the way the guy who
sold it to me told me he only gets 10 gallons after I
complained how bad mine was.