It is, but it is expensive. I've been using XENTARI since it became available through this forum. Much, much cheaper to use. One bottle of Certan is mixed with 19 parts water using the bottle as a measure. 1/4 TBS of XENTARI makes a similar amount. The Certan cost me over $20 with shipping for a bottle; the XENTARI cost me just over $30 for a pound. The Certain makes enough liquid to treat about 120 frames, a 1/4 TBS of XENTARI will treat the same amount of frames.