How to drop Alkalinity and keep it stable?

[untamed]

Originally Posted by RuGlu6

Thanks for replies people,
Sorry forgot to mention the obviously needed info.
Cal level is 420ppm
Ph main tank 8.3-8.4
Ph Reactor effluent 6.6 with one bubble every 4-6 seconds, can't make it anything less the that.
Reactor effluent is steady drip but fast enough to not to be able to count drops.
I just switched to Reefers Best salt maybe this will make it better...
I have few SPS and some LPS so there is a need at least for some Calcium.

pH seems high...This doesn't seem to jive with high Ca/Alk. I can't easily explain it, but I would also not worry about it.

Ca is high enough that if you shut down that reactor, you'll see the Alk fall...while the Ca will also fall but much more slowly. I still think that is what you need to do.