Hey Tangoman,
Let me give you the skinney, lowdown, whatever you want to call it.
Tony(Delphinius) has an ro unit but dosent use it on his SW tanks
Myself i have a kent Ro/Di unit and use it faithfully
Deb(EmilyB) uses Ro/Di on her systems
Bob(The lumper
) Couldnt imagine using anything but tap water on his tanks
Kim(tau2301) uses tap water
Alan(Alan Joseph
)He kinda uses a little bit of everything, but to my knowledge, mostly tap water.
Our water is fairly clean but when i replace my Micron cartridge in the 1st chamber of my Ro/di unit it gives me a chance to see what just the micron filter itself has filtered out.
I find in winter/fall it remains fairly clean for 6 months but durring spring/summer runnoff time my micron cartridge get's dirty very fast!
I use Ro cause it just makes me feel better about my system rather then having the constant addition of top up water and adding and concentrating all those nasties that are in our water in one spot.
I did start my tank with tap water and have used it a few times without any problems.