The parts are shown below:
- Drinking water filter S$17 (AMDUS) or S$12 (CRYSTAL), there might be even cheaper brand
- 3/4 to 12mm hose connector: S$3.50 x 2 (Hose size can be anything from 12mm, 14mm or 19mm)
- DYMAX CO2 atomizer (can't remember the price, reuse my old atomizer S$1~S$2)
- Less than 1ft 3.5cm outher diameter PVC pipe S$0.60
- Air hose connector S$0.10
- Epoxy glue (left over from previous project)
Total around S$27
The plan is to make the water flow around the white PVC in circle. Below ais the sketch of how the water suppose to flow.
First, remove the red color button and replace it with air hose connector. Glue it with epoxy glue. To remove, just unscrew the red button from inside. This red button was originally used to expell air trapped inside the canister.
Second, connect the CO2 atomizer to the air hose connector as show in the picture below. This is optional. You can also use those small air stone, as long as it can fit in.
Next, connect the 3/4 to 12mm hose connector to both inlet and outlet and glue the PVC pipe to the blue color filter head and you get your self DIY external reactor. All done in less than 10 minutes except for the fact that you need to wait until the epoxy dry. One idea by fellow forummer at AQ is by using the inner part of filter media, you need to remove the media first though.
Lastly, I add piece of plastic (black plasting thing on top of atomizer) to direct the water flow. It can be from any plastic, in my case it was from ice cream contriner cover and cut it to fit.
This is how it worked during test: