Water change math

"Altum" wrote in message
. net...
Bill Stock wrote:

Hope I solved the diffeq right! I'll be really curious to hear how the
actual measurements turn out.

Yeah, I'm pretty sure you did. I ran the numbers through Excel and I came
very close to the numbers produced by your equation. I assumed the reduction
per hour for the additional Crap (.15) would be close to the average
addition per hour. I got 25.15, you had 25.22. LOL.

Have you considered putting a cheap flourescent shop light over your
sump and growing duckweed or anacharis to lower the nitrates? You could
even harvest duckweed and feed it to the GF (mine love duckweed).

I considered some WH (Water Hyacinths) for the existing setup, but I would
have had to use a Sump Pump and hang-on overflow for the plumbing. A little
too much chance of a leak for my taste. The new sump is'nt a very good shape
for growing plants, but should make a good settling tank.