yep volcanic glass is hard to compact, it's like styrofoam :thumbsup:
canadianhemperor Reviewed by canadianhemperor on . How can i lower and higher my pH and does perlite affect pH? Hey im a first time grower and i am just wondering how to alter my pH levels and if perlite affects the pH as i am using this with MG all purpose compost, does anyone no? Rating: 5