I called in my plumber yesterday to add an adapter to my faucet near my aquarium. He noticed the big bulky RO
unit I have under the sink, and he told me, you don't want one of those. He said that 99% of what is filtered in an RO
unit is filtered in the first stage and by adding more stages it will just mean more maintenance. Well I was shocked, I bought this expensive 5-stage unit to filter my aquarium water and he says it is unnecessary. I thought about it and it makes sense if the particles and chemicals don't get through the first stage, what are the other four there for? He actually demonstrated that filtered water from my RO
unit has a TDS
of 2. While water from a single stage has a TDS
of 3. I don't know what to say, but I'm still keeping my unit until I know that it is safe. What do you think?
P.S The single stage Unit is called *Eagle Spring*.