[CubsFan]

Reef Water Aquarium Reverse Osmosis RO DI combo Filter - eBay (item 270257842356 end time Jul-30-08 23:26:28 PDT)

I need a unit and was wondering what you guys thought of this one?

[Samper]

The unit doesn't look bad. I order mine from Products and answers for your water treatment needs.

This is the unit that I have the most experience with.
Typhoon 5 stage RODI Reefkeeper 75 GPD

I also have these in operation.
Compact III 75GPD with DI Bypass Assembly and TDS Meter

If you order from them no matter which product you order ask for a free tds meter. I have a stockpile because they give me one with each unit.

The main thing that you are going to want is access to replacement filters and quality customer service. I don't think you would have a problem but wanted to give you some food for thought.

[CubsFan]

That one is even a better deal. How often will I have to replace the filters?

[Samper]

I can't really answer that. It is going to depend on how often you use the filter and the quality of the tap water you are feeding it with. Every area is different. Around here I live very close to a water tower and my total dissolved solids (tds) are on average lower than many others around the city.

I change out my carbon and sediment filters pretty often just to ensure quality. These are changed about every three months. The DI resin is changed out about every 5-6 months and I purchase these from airwaterice.

The tds coming from this filter should read 0. Get a meter. As soon as you see it creeping up on you it's time to think about changing them out.

[Samper]

I forgot to mention that these filters tend to operate best at 60 psi and at a temperature warmer than cold tap water. 77 degrees is best. You may have to tap into a warm and cold line to achieve this.

I had a hard time getting the pressure when I lived in my home town. I ended up getting a booster pump. Booster Pump System Power Station for Reefkeepers

Since moving I haven't needed the booster.