Hello all, I would like to know if there is a filter (other than a complete RO system) that can reduce the KH for the purpose of using the water in a tank? I want to acquire some sensitive plants that require a KH<3 and want a way to reduce KH permanently. Perhaps Ion exchange filters? Cation exchange? I know those don’t remove the minerals per say and rather swap them but are they suitable/effective for reducing KH? Yes? No? Why? Thank you everyone for enlightening me.