rodi unit help

[Amadod2]

so i bought a new4 stage rodi unit from brs and ran about 100g through it, and decided to test the water and it was reading .15ppm with my hanna checker…i was surprised i thought it was going to read 0.00ppm, is this normal, what should i do? i thought the filters were to last a long time

[Slyguy00]

Keep running water through it. It will eventually clear up. I ran about 150 gallons through mine before it tested at 0.

[Amadod2]

really, i never heard that, the instructions do say to run it for an hour, but mine has made at least 100-200g

[The Guy]

Originally Posted by Amadod2

really, i never heard that, the instructions do say to run it for an hour, but mine has made at least 100-200g

Has your Hanna checker ever been calibrated, mine was off quite a bit until I adjusted it with Hanna solution. Got lots if you need some.

[BlueTang<3]

You are concerned with the tds coming out of the ro unit.
I stole this from as desert rat on nano reef.


TDS does not necessarily mean 0 phosphates. Phosphates like silicates and forms of ammonia are weakly ionized and may not register on a hobbyist grade TDS meter, it would require a conductivity or resistivity meter to get to that level for sure.
That being said, if you are getting a reading of 0 TDS I would say its safe to assume the phosphate levels are low enough to not be a concern in the RO/DI water

[Amadod2]

i never heard of calibrating a hanna checker, im going to look it up.


i dont have a tds meter on my rodi unti, i was only using my hanna checker