To test if the RODI unit is working, I purchased a TDS (Total Dissolved Solids) meter. It is a simple device, just hold the probes in the water and wait a second. Results are fast, and appear to be very accurate. I did a couple experiments to get a better understanding of TDS in different environments.
In my existing 40 gallon breeder, the TDS reading was 385. Not really surprising. In my house water, which is filtered, the reading was 250. Also not terribly surprising, considering our city water is liquid concrete. The reading in some water I had made from the RODI unit was 7.
Overall, I can see how useful the TDS meter will be moving forward. It is just another tool to help us keep track of what is going on in our tanks.
Just completed a 5 gallon water change on the 40 gallon. The RO unit is working great, and the water is testing where I expect. I will get a TDS meter on Monday, and I can further validate the RODI unit’s effectiveness. I will continue these small water changes over the next couple weeks to see if there is a difference in the algae growth. And hopefully, with that under control, I will begin to move over the existing plants and start transforming the tank to the West African biotope.
I hooked up all the water lines and got the RODI unit semi-installed. I ran through about 2 gallons of water, just clearing the membranes. I will now need to get a couple large containers to hold the filtered and waste water. Throughout the week, I am going to continue to flush a couple more gallons through the system before testing and using it in my tanks.