just been feeding the exo sog with a bit of home made pk, potassium bicarb the water then pH down with phosphoric acid then mix up the nutes and add the green planet terps, that product safety certificate says fuk all really and its a bit more than potassium sulphate by the smell and colour but I would deffo not recommend anyone uses it at all cos its too pricey, but I will continue as the feedback from the customers was favourable and I like terpinator exo