When to test.
An established pond with
healthy Koi fish should be checked every month.
It is only when you notice something out of
the ordinary, and possibly during seasonal changes,
that an additional test or two might be prudent.
An ounce of prevention is worth a pound of
cure. A simple test, at the right time,
can prevent a minor problem from becoming a
When starting up a new pond or Bio-converter
system, daily tests may be required until the
converter comes on line, then weekly for a couple
of months until the system has stabilized.