Phyton-27

[BikerDoc5968]

I know there are several people out there that use and swear by Phyton-27 for specific situations like crown rot and other fungal/bacterial infestations. The product contains Copper Sulphate Pentahydrate...21.36% and the the rest is inert stuff. CuSO4 exits in several forms from an anhydrous form to the most common salt form pentahydrate CuSO4 . 5 H2O. So my question to all you users and non-users is this: What is the difference between this product, Phyton, and Copper Sulphate Pentahydrate (Enforcer 32oz 99% CuSO4) available for considerably less at Lowe's or other big box/garden centers? I'm not a chemical engineer but am I missing something here...????