This project started with me trying to reduce my phosphate levels in my SPS aquarium. I have a 4 stage RODI filter that I bought from a local aquarium shop in Tampa Florida. I worked well for me but I was fighting phosphate problems. After checking Phosphate levels in my aquarium, RODI water, and My newly mixed salt water I had some surprising results.

Phosphate Before I started levels:

Tank:                             .05ppm

Newly mixed salt water:  .04ppm

RODI water:                   .01ppm

Original 4 stage RODI Filter

This filter has the following stages:

1 stage: 10m particulate filter

2 stage: 5m Carbon Block

3 stage: Reverse Osmosos

4 stage: DI Resin

I want to add one more carbon bock and one more DI (to help with my phosphate). I started by purchasing some 2in. aluminum L brackets, and two more canisters that I got from a local Aquarium shop for $12 each. I used the holes in the tops to mark on a piece of paper so I could drill the holes in the aluminum at the correct locations.

After Drilling the holes I attached the canisters.

The RO filter brackets would not exactly fit so I added a small flat plate.

You have to remember to put the restricter tube in the wast water output from the RO stage.

After full assembly. I put a short piece of L bracket at each end to make it stronger as well as give me a good place to set the whole unit on bookshelf brackets on the wall. These end pieces also keep the wall from banging into the 90 degree john guest fittings.