Ro Water - What To Add?

[STD]

I use RO water for topup and am thinking of also use it for water changes as my tap water is fairly hard and I want to keep soft water fish

What if anything should I add to the RO water?

 

[CFC]

When i was using R/O water i used KENT R/O Right and KENT pH Stable to remineralise and stabilise the water. I had no complaints about the products and a little went a very long way.