I was given a Kent TFC 24 GPD RO
unit this last week. After hooking it up I was pretty shocked at the abymsal waste to product ratio. I know it's not great with RO
in general, but this was pretty phenomenal.
We have well water, so it's not a per gallon cost issue for us, but I can't abide running that much water down the drain just to make a few gallons. Yes, I realize I can capture it for something like watering plants... but I'm more interested right now is speeding up the RO
process and making it easier to run.
I rigged up a pressure gauge today and determined (as I suspected) that my pressure is low. I'm getting just over 20 PSI in the line between the second filter and the membrane. I think 65 is the recommended PSI.
Also, my water temp right now coming out of the pipe is around 61 degrees which, if I recall, is also going to slow down the process.
Considering these factors, it's not real shock that the rate is so horrible.
My question is in regards to the waste water. Is this not just water that couldn't be pushed through the membrane?
Assuming that is the case, why can I not fill a trashcan with maybe 25 gallons of water, drop in a heater to get it in the ideal temp range for the RO
and plumb in a booster pump?
My thought is to suck water from can with the pump, push it through the RO
at the ideal pressure and feed the product into a second trashcan. The orange hose (waste water) could go back into the source can to be rerun. Over time it seems you would process all of it and closer to a 1:1 ratio.
Add in a water level sensor to run the booster pump and it -seems- like I would have a closed system that could run itself without running the pump dry as it hit the bottom of the source trash can.
I'm sure there is some reason NOT to do this since it seems so logical and I've not heard anyone doing it already.
Is the waste water from the RO
unit truly "waste" or just the water that couldn't be pushed through the membrane due to pressure, etc?
Any thoughts or explanations would be appreciated.