Has anyone used a remineralisation filter on RO water as an alternative to products such as tropic marin salts or something similar. The Maifan stone appears to put a lot of essential minerals back into the water and this may be ok for drinking but I don't know about fish. It appears to stabilize Ph but again I don't know if it makes it alkaline. It seems a simple solution to retro fit this to an RO filter rather than mess around with salts. Advice would be welcome.