[repairman68]

Hi can anyone tell me witch is better a RO/Di unit or a Ion exchange filter like the one Kent Marine offers on Pet solution @Deion 200R - Pet Solutions
Thank for any advice in advance Scott

[glampka]

An RO/DI filter is better. The ion exchange filter is the DI portion of a RO/DI filter. In RO you pass the water through a very fine mesh membrane which removes very small particles from the water. www.airwaterice.com Products and answers for your water treatment needs. sells a nice little RO/DI filter for $99 called the MightyMite. A number of us have it. I've also heard good reports on I believe the Filter Guys but I'm not sure of their website.

[repairman68]

Thanks glampka for your advice and link

[tattoodjay]

Am Just curious how often do you need to change the filters on a RODI system such as the mighty mite?

[glampka]

Difficult to answer. It all depends on the TDS of your water supply. The higher the TDS, the more frequently you need to replace the filter medium.

[tattoodjay]

Sorry but here comes a silly question...

TDs - whats that -

I dont have a reef tank yet but plan to in a few months so trying to learn all I can before hand

[glampka]

Total Dissolved Solids - it's all the junk that's dissolved in your water supply. Ideally you want a TDS of 0 but 1 -2 is ok.

[tattoodjay]

Thanks appreciated