Quote:
Originally Posted by yifan917
Yeah I thought so too.... and another thing is I took off the RO and only using 3 stage filtration (5-micron => Carbon block => DI) and the TDS turns out zero as well...... so now I really don't know what to do.....
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Well, that's odd. The DI resin should only be able to handle 40 ppm, and I don't think the carbon would take out 20 ppm...maybe though. Don't do that too much though because your DI will wear out real quick with that high TDS going to it.
When you test the water (whichever water it is), are you filling a small glass, and testing from the glass or just holding it in the water stream?
Ok, try this. Hook everything up the way it's supposed to be. In one sitting, retest the tap water. Turn the RO/DI on. Let it run for about 1/2 litre (about 4 cups) of product water. Turn it off, unhook the hose after the carbon. Turn it back on and catch the water coming out of there immediately. Test that water. Turn it off, hook up that last hose and unhook it after the RO cartridge. Turn the unit back on, and let it run for about 5 mins. Then catch the (good) water coming out of there and test it. Catch the waste water and test that too. Then hook it back up, let it run for 5 mins, and catch the final product water after the DI. Test that. Report your numbers here.
If you lived closer I would bring my TDS meter over and help you out.
Quote:
Originally Posted by Canuckgod420
what do you mean you took off the RO? those 3 filters your using make up your RO unit.
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You can detach the hoses, and test the water before it enters each stage. What he did though, is removed the RO membrane, and tested the water after it ran through the others.