I mix 3 parts Oceanic w/ 2parts IO for water changes. I purchased alot of Oceanic when it went on sale in town and had another bucket given to me. I stir the solution w/ a drywall mud paddle attached to a 1/2 electric drill. I place a maxi-jet 1200 in the bucket overnight so the solution reaches saturation. Works well for me. I usually dose the holmes-Farley home made additives and drip Kalk. When I am busy/lazy or out of town ESV products go in. No precipitation problems in the bucket or tanks. All systems have good coral and coraline growth. I still have to watch my Alk closely. I will be out of Oceanic soon and will only be using IO in the future. This will be in an attempt to stabilize my Alk levels.