Hi, I have a question about RO/DI units. Are they always hooked up to a tank like a skimmer is, or just used to replace water that has left the tank, like by evaporation or during water changes? Are they connected to a building's plumbing, or just connect to a faucet somehow, or otherwise? I have not seen one in person, and would like to learn these things before I go out and buy one. Thanks for your time!
ro/di unit setup
- Thread starter Bandapin
- Start date
There are lots of ways to set up an RO-DI filter. Mine is tapped into the water line for a sink faucet, and lives under that sink. There's a needle valve to control water flow. Other design include an under-sink water tank, and so on.
I run the clean water output line into a 5g container that sits in the sink, and then transfer that to containers that feed an autotopoff pump. Works well for me. Some people plumb them to the tank via a switch that drips water into the tank on an as-needed basis, but I've always been afraid of the failure modes.
I run the clean water output line into a 5g container that sits in the sink, and then transfer that to containers that feed an autotopoff pump. Works well for me. Some people plumb them to the tank via a switch that drips water into the tank on an as-needed basis, but I've always been afraid of the failure modes.
hopper
New member
Mine is hooked up in the laundry room with a y-adapter from the washing machine water line. Drop a five gallon container under it and a few hours later swap it out with another one. I do about 20 gallons a week like this. They are not as compliated as they look. All the lines are simply water lines that are feeding one canister after another in a series and most RO/DI units already have these installed in the proper order. All you have to do is hook it up to the water supply. Initally you would need to run about 5 gallons of water through it and after that you are good to go.
smleee
New member
I currently have mine sitting in a shower (paranoid of flooding) of a spare bathroom while waiting for the fish room to be finished. I hook it up to the sink faucet when making water and put the waste line down the shower drain. Good water fills a 5g HD bucket or a 20g Brute. There are countless ways of hooking one up! 
Since you mentioned buying one, here are some key things to remember when choosing an RO/DI unit for aquarium use:
1. Make sure and get a genuine DOW FilmTec membrane. These are the best performing membranes available. Some sellers make other claims, but are flat out lying. Some even sell cheap knock-offs.
2. Full size vertical DI canisters. Hollow horizontal DI tubes are not as affective even when mounted vertically and/or packed tightly with resin.
3. Customer service.
eee
Since you mentioned buying one, here are some key things to remember when choosing an RO/DI unit for aquarium use:
1. Make sure and get a genuine DOW FilmTec membrane. These are the best performing membranes available. Some sellers make other claims, but are flat out lying. Some even sell cheap knock-offs.
2. Full size vertical DI canisters. Hollow horizontal DI tubes are not as affective even when mounted vertically and/or packed tightly with resin.
3. Customer service.
eee
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