How to lower alk?

There’s no benefit to a higher concentration except cost. Wiping it down might help reduce precipitation, but folks who have lowered even normal IO to 7 dKH with acid do not seem to have precipitation, probably due to the very low pH.

Do you see any?
 
I actually haven't tested my pH at all. I do run an airline from my protein skimmer intake tube to the outside of my window.
I need to grab a pH test kit to see where it sits.
 
My best guess (if the alk rise is real) is that the pH is so low that, like a calcium carbonate reactor, you are dissolving more solids, if there are any there. If you see deposits, maybe dissolve them away with acid between batches of salt water.
 

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