Acid Magic, Muriatic Replacement Acid, 4 Pack of 1 Gallon Bottles Special Shipping Information: This product may not be available for 1 or 2 day shipping due to federal regulations that require it to ship via ground ship methods only. This product can only be shipped within the 48 contiguous states. 90% fewer fumes - less fuming issues Safer handling - does not burn intact skin Very economical to use -- a little goes a long way More effective in reducing high pH than dry acid products