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yellowtruck75
10/18/2006, 10:06 AM
I am having problems with my 50 gpd RO/DI system. I replaced the membrane and the DI cartridges just last year. The unit seems to be pushing more waste water than usual and there is some green algea in my tank now. Should I get an new system or get all new filters?
Billybeau1
10/18/2006, 10:34 AM
That is the TDS of your output water ?
yellowtruck75
10/18/2006, 11:04 AM
I have no idea, I don't have a TDS meter
loweryster
10/18/2006, 11:12 AM
Very important when making water.

http://www.spectrapure.com/St_quality_p2.htm
BeanAnimal
10/18/2006, 12:21 PM
Nobody will be able to help you without knowing:

Input water TDS
RO output TDS
DI output TDS
Water temp
Water pressure

Bean
magma01
10/18/2006, 12:33 PM
DI cartriges normally should be replaced every couple of months. (Depending on usage and input water TDS of course). You DI is probably spent.
yellowtruck75
10/18/2006, 01:35 PM
Well my real question would be. Is there any reason that the system would be creating more waste water than usual, clogged filter?
AZDesertRat
10/18/2006, 01:44 PM
Use a measuring cup or other graduated device and a watch to time the flows from each. It should be in the 4:1 waste to good ratio. Its possible the membrane has failed and is passing water to waste, or it has shifted and is bypassing the membrane but without TDS readings you will never know. Its foolish to own a RO/DI ystem without a good TDS meter, you are shooting in the dark and can actually be making the water worse than tap with exhausted DI resin.
BeanAnimal
10/18/2006, 01:50 PM
magma... That is like saying you should put gas in your car every couple of days. We can not answer his questions until he gives us the requested values. The DI has nothing to do with the RO and the wastewater output.

He lives in PA and the weather is getting colder. Colder weather means colder ground temps. Colder ground temps mean colder supply water. Colder supply water means less RO and more waste. Those are facts.. but that still does not give us a true picture of what the OPs problems are or how to address them.

A good handheld TDS meter is a MUST!
yellowtruck75
10/18/2006, 03:42 PM
How are the inline TDS meters?
AZDesertRat
10/18/2006, 09:02 PM
Not nearly as accurate as handheld ones. They are not temperature compensated even though they claim they are.
yellowtruck75
10/19/2006, 11:16 AM
I think I will buy a hang held TDS meter this week and if the number is high then I will replace all the filters.
BuckeyeFS
10/21/2006, 04:47 AM
Yellowtruck - you've received some good advice here from Bean and AZ. Sounds like you're on the right track now.

Russ @ BFS