"chris nuttall" wrote in message
om...
i know you can add various things to your water to buffer the ph
towards a certain value, that value being different depending exactly
which mineral(s) you add, but does anyone know what will buffer to a
ph of 7?
Sodium bicarb buffers to around 8 i think
coral to around 8.2 ish
limestone...not sure

I did try evian! its got 360ppm bicarbonates (kh) and is ph 7.2, so
you can add as much as you need to achieve any kh you want, but its
effects seem to be temporary, and i think i need to add a solid so
that it can slowly dissolve.....but what to add?

chris

I think Red pretty much covered all the bases.

I had a PH crash a while ago and tried a few products. I tried the lawn lime
(not slaked) first and it was OK, but it was messy. I also tested some
limestone screenings (meant for under patio stones), which worked better
(faster) then the lawn lime, but had to be thoroughly washed, as it
contained a lot of contaminants. Finally, ended up using the crushed coral
in my filter, as it was cleaner and fast acting. My KH is around 150 and PH
stays around 7.5 using the coral. My test samples of lawn lime and limestone
screenings were somewhere around 7.8 after a week.