Quote:
Originally Posted by
Lam Nguyen 
I know that many of you guys are thinking, "Duh, what is this guy thinking?!". However, I am bringing this up because I am not understanding something. I do daily to weekly SC water changes and I also have a constant trickle of water in both my indoor QT tank and outdoor main pond that replaces about 10-15% of the total water weekly. I practice this religiously because I was told by many hobbyists and esp by my Koi Coach Dick Benbow. But my question is, if your water parameters are within the normal limits, then why do we still need the recommended 10-30% weekly water changes? I mean, I can understand why we need to empty our mechanical chambers, but why the constant water trickle and weekly pond water changes?
My belief is that as long as the following water parameters are in check, then the water quality should be fine. These parameters include: temperature, pH, salt %, GH, KH, ammonia, nitrite, nitrate, TDS, ORP, & DO. What is it that these koi are using up from the water that we are not detecting? And is it possible to replace these "things" without having to replace water? Just curious is all.
