Hello people, im sick of buying woodchips and just plain shitty mixes. Doe anyone know of any good potting mix i can buy? Specific brands you guys with years of gardening experience can reccomend? Also is there any particular type of sand (i know sand is basically just silicon dioxide but im thinking differant types may have differant micronutrients and whatnot?) that is good? I want to repot some cactus and plants and I AM NOT planting my plants in this cruddy mix.. No. Thankyou in advance.