I have only really used it to soak the Microfiber inserts in their wet pail. I'd say no reason to prebuy.
Mom to LO#1 born 1/7/2010; Cloth diapered since day 1; Part-time EC since 9 months; Daytime PL since 29 months & LO#2 born 12/1/2013; first diaper was a tiny Swaddlebees Newborn Fitted! Curious of my Newborn Stash? Checkout my absorbency tests.