It does to some extent, but I tested my well water which is what I've been using and my alk from the tap is 11.5! So add that to the alk in reef crystals and it's mixing at a alkalinity above 15 dKH. Wasn't so much of an issue when we were keeping the alk at 11.5-12 in the tank, but it is now that we are keeping the alk at about 9.3 dKH. That's where it is sitting stable with no water changes or dosing, just top offs using well water, so that's where we want to keep it. We are going to be buffering the saltwater for water changes using sodium bisulphate. Hopefully that makes all the difference.Does reef crystals mix high alk then settle down after awhile? That is terrible. Sorry