I don't think CuSO4 will work well on Chara. CuSO4 is even more useless in higher hardness such as what Cecil has. The greater the water hardness the more quickly the copper binds with the carbonate and precipitates making it more ineffective. Chara can be a tough one to control. In many instances Cutrine plus granular will work on Chara. Kelly Duffie is our go to man for this specific problem. I suggest you PM Kelly and see what he suggests for Chara in hard water. Let us know what Kelly recommends. Cecil do you know the hardness/ alkalinity concentration? High hardness may be inhibiting even the Cutrine-Plus. You may need a adjuvant with the algacide. I doubt the Hydrothol will work on Chara since it is an algae.
Last edited by Bill Cody; 04/19/12 09:52 PM.
