Scotty Fraiser
Aquarium Advice Activist
- Joined
- Mar 18, 2013
- Messages
- 175
If my tds meter starts to read high I think I need to change the di resin. How do I know when the other filters need changed? Rodi unit is 1 year old and doing 15 gallon water changes every two weeks. Have only changed di resin once about a month ago and the tds is already reading 25. Thanks for any help in advance.