I recently upgraded my 300gpd which was giving me around 300ltr per 24hr to a 450gpd( extra 150 membrane) and its now giving me 500ltr per day which is sufficient.
But my ppm's rising too quick! Im going through lots of resin.
I fill a 1000 ltr ibc and transfer, I dont use a booster pump ( maybe I should?)
My taps come out at 175ppm on average which isnt bad and i think it comes through ro at 20ppm before resin, I use 1 of them little 1ltr polishers. I do have a 25ltr resin vessel but realy cant be arsed resin changes with that anymore, reet pita.
What should I do?
Dont want to spend too much on the problem if possible so please dont say say buy something expensive. Cheers
I would suggest the solution is to find out why your r/o is working so inefficiently.
Tap water 175ppm and pure after r/o 20ppm means that the r/o is only removing 89% of the impurities in your water. It should be between 97 and 99%. So your rejection should be about 3 to 4ppm. Mine ran on 40psi with 250 ppm in and 4ppm out after r/o with no booster pump. I had a 3 to 1 inline restrictor. We had some major pipe work done in the area and our tap water improved to 120ppm. The r/o
You need to take the tds of the pure leaving each membrane and identify which one is at fault.
Are all the membranes 150GPD?
Have you got the right restrictor - in other words, what is your pure to waste ratio.
You could always add a pressure gauge onto the r/o. A small one with a rear 1/4" push fit is fine. It will just need a bit of 1/4" tubing and a 1/4" push fit John Guest Tee. I had one on my r/o between the prefilters
The di vessel that comes with the r/o is too small and a waste of time for window cleaning. I would suggest a 7 liter di vessel as it will last longer and is easier to empty and refill with resin.
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