RangiSTaxi
Well-Known Member
chunky pumice sand is even better than hydroton, but may not be available in your country, perlite is finer but another option.Not a fan of RW as it holds water too long, but, Im not a hydroton either, fan due it breaking down, BUT, if he raises the return pipe ~ 1" off the bottom of each grow container, then most/all the hydroton particles should simply stay on the bottom of each pot