Mandrew
Well-Known Member
I just got a new RO/DI unit and I was wondering if there was anything specific I should do before I put the water in my tank? Or is it as simple as plug it to water, crank it up, and use the RO/DI it produces? Thanks!
New RO/DI HELP!
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wildcrazyjoker81
Well-Known Member
+1 on above
At a minimum, remove the DI cartridge and flush RO only water down the drain for the first 3-5 gallons to rinse the membrane and not contaminate the DI resin.
I prefer to rinse each filter individually so it does not foul the next filter downstream. Remove the sediment, carbon block and DI filters. Disconnect the 1/4" line leading from the carbon block up to the RO membrane housing at the RO end and stick this line in the sink or a bucket. Install ONLY the sediment filter and the empty carbon canister, tuen the water on and flush the sediment filter to remove any glues and binders from the manufacturing process for a 3-5 gallons. Next install the carbon block and again flush it to the drain for another 3-5 gallons to remove any carbon fines or dust. Reconnect the 1/4" line to the RO membrane and make 3-5 gallons of RO only water, monitoring the TDS until it reaches its lowest point, probably 98% lower than the tap water TDS. Finally install the DI filter and send an additional gallon or so down the drain until your final TDS reaches 0 and you are ready to make water.
You repeat this process every time you change filters and disinfect the system at the same time to keep it operable.
I prefer to rinse each filter individually so it does not foul the next filter downstream. Remove the sediment, carbon block and DI filters. Disconnect the 1/4" line leading from the carbon block up to the RO membrane housing at the RO end and stick this line in the sink or a bucket. Install ONLY the sediment filter and the empty carbon canister, tuen the water on and flush the sediment filter to remove any glues and binders from the manufacturing process for a 3-5 gallons. Next install the carbon block and again flush it to the drain for another 3-5 gallons to remove any carbon fines or dust. Reconnect the 1/4" line to the RO membrane and make 3-5 gallons of RO only water, monitoring the TDS until it reaches its lowest point, probably 98% lower than the tap water TDS. Finally install the DI filter and send an additional gallon or so down the drain until your final TDS reaches 0 and you are ready to make water.
You repeat this process every time you change filters and disinfect the system at the same time to keep it operable.
Make sure to check all three TDS points, tap water, RO only water before the DI and final RO/DI water. You need all three numbers to know how the system is working.
You will want to invest $20-$25 in a handheld TDS meter as this is the only tool you will have to gauge RO and DI conditions and when to replace the DI resin.
You will want to invest $20-$25 in a handheld TDS meter as this is the only tool you will have to gauge RO and DI conditions and when to replace the DI resin.
I wouldn't do that.
I have posted the drawbacks of the inlines many times here on R2R.
For one they lack the accuracy of a handheld in the same price range and another is they are dedicated to two places and you need three TDS readings for a RO/DI not two. They cannot be used portable so you will still need a handheld to test the tap water TDS and the TDS of your top off water.
Inlines are not temperature compensated, they sense air temperature not water temperature like they should be doing and like a $20-$25 handheld does.
I have posted the drawbacks of the inlines many times here on R2R.
For one they lack the accuracy of a handheld in the same price range and another is they are dedicated to two places and you need three TDS readings for a RO/DI not two. They cannot be used portable so you will still need a handheld to test the tap water TDS and the TDS of your top off water.
Inlines are not temperature compensated, they sense air temperature not water temperature like they should be doing and like a $20-$25 handheld does.
I can tell you I have two of the dual inline meters and never even turn them on anymore, they never agree with either of my calibrated hand held meters. Unless the air temperature abd water temperature are exactly the same they will never be quite accurate and can be significantly off when the air and water differ a lot. Plus you would either need the new three probe inline meter or two of the dual inlines to monitor the points you need to monitor and still be inaccurate. The same company, HM Digital makes the most popular handhelds at for about the same $$ or less. Check out the TDS-3, TDS-4TM or AP-1, all are ATC compensated, 2% accurate, can be calibrated easily and have built in digtal thermometers so serve dual purpose.
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