jeffaquarius
Aquarium Advice Addict
Thank you for the info about the RODI though. We just changed all the cartridges but I am not sure about the one that is only good for 400 gallons. I guess I wwillbuy him a tester and add it to his christmas gift lol.
That would be a wise gift for him. Some hobbyists have changed their ro/di filters only to find later that they installed it incorrectly resulting to high tds.