adding KH buffer to top off water

[ccws]

My LFS has stated that this should be done because the KH of RO/DI water is 0.
Is this what I should be doing everytime I top off. My current KH is 7. Ph 8.2
Thanks

 

[ccws]

bump

 

[snailheave]

i use lime water. it does the same thing.

 

[ccws]

What is lime water? So I should add KH buffer to the top off water?

 

[reefnut]

Well simple answer is no, you should not add any buffers to the topoff water. If your alkalinity is 7dkh, what is your calcium?? If anything add a buffer to the tank to adjust the alkalinity.
With limewater, or kalk water. You mix the fresh water with kalk mix which forms a solution that is balanced with both alkalinity and calcium. The solution has a PH of 12+- so it needs to be slow dripping into the tank.

 

[ccws]

Calcium is 440.