Why you NEED RO/DI!!!

[theredben]

I was just pondering over the last couple of days if it is sooooo bad to use regular water for water changes and only use ro/di for evaporation replacement. I was thinking that the only reason that MOST people see a problem is that they are using 20ppm water to replace the 0 ppm water that evaporated. This would be an upward trend that would end up with a bad case of algea.

[Doug]

I do use commercially purchased ro water for water changes and my ro water for top-off. I would not use our tapwater. I only wish it was 20ppm but more like 400ppm.

[spencerC]

Could i test the ppm in my water?
Do aquatic stores sell test kits for that?

[surgeonfish]

Originally Posted by spencerC

Could i test the ppm in my water?
Do aquatic stores sell test kits for that?

You sure can test your water with a TDS (Total Dissolved Solids) meter. They are either hand held or can be attached to your water purifier to test the incoming and outgoing water. Most LFS that sell water purifiers should carry TDS meters.

Link: http://www.jlaquatics.com/phpstore/s...t_ID=ro-aftdsh