Quote Originally Posted by keith_r
my growbed is mostly gravel, topped off with hydroton, i put in a few dozen worms last year, and there are defintely more now
Have you had to clean the bed yet? You see I'm mostly concerned that if I combine my Bio-Filter into a Particle Filter combo, and I have to clean it out due to clogging then I would lose my beneficial bacteria. Perhaps I shall just create a Particle filter as well and run them in tandem