1a254978_der_Scrolls_V_Wiki___Neoseeker__Effect
[Perk] Purity [Skill Level Requirement] 100 [Perk Requirement] Snakeblood [Effect] 
All negative effects are removed from created potions, and all positive effects are removed from created potions.
Alchemy - Skyrim - Elder Scrolls V Wiki - Neoseeker
Effect