| Russ:
We have been running one of our two bead filters for 3 years now and never had any problems with bio filtration even though our KH is only 59 with a pH of 7.5...
Our readings for ammonia and nitrites have always been zero, some say that this can't be because koi constantly emit ammonia, but that's what the tetra test kits say...
Added DIY Bakki Showers after the beads and our reading got even better, reduced nitrate, with ORP readings in the 350-400 range...
Aloha! Mike |