Cooper sulphate miracle blue stuff for pools

500 grams of pure copper sulphate. Copper sulphate is miraculous in pools, spas and hot tubs. It is also used as a fungicide, algaecide, root killer, and herbicide in both agriculture and non-agricultural settings. It is also used as an antimicrobial and molluscicide. It can be used in both chlorine or salt water pools. I package these myself so it will arrive in a doubled ziplock bag and not the mason jar as pictured (I leaned that lesson the hard way after a jar broke in transit) New to Poshmark use my code MELANIEIRWIN552 to get $15 off your first purchase.