Another PH question.

[aceroc]

I took a water sample to my LFS and my PH was 7.8 so i bought some Seachem Marine Buffer. This stuff works for a bandaid but does not keep the PH up. So i went to another LFS and they sold me Seachem Reef builder because my PH and ALK was low. What can i do to keep my PH up with out having to buy all these addatives and dosing all the time?

 

[carshark]

figure out what is causing the PH to go down.. has it always been at 7.8? or has it taken a dive? also check your change water make sure the PH is where you want it, and use a teeny bit of buffer with top offs.
basically we need to figure what is causing the low PH

 

[aceroc]

I can test my R/O water now if that helps,it is from my LFS. It has taken a dump. It use to be at 8.2 then when i tested my water before i was going to do a water change to do a comparison it was at 7.8 so i took a sample to my LFS and they read a low reading too.

 

[aceroc]

Do i test the R/O water with a saltwater test kit or freshwater test kit?