I picked up a RO/DI and I need to change the filters. Can I use any brand of filter are they universal or do I have to get the same brand as the RO/DI unit?
Definitely different company - they are cheap if bought outside the provider (typically) For example, Spectrapure replacement filters are a fortune compared to a similarly sized filter
call russ at saltwater critters, a vendor and a member here. he'll answer any questions you have and get the filters to you in a day or two. one of the best around.