crashinc25;1699556; said:I applaud the effort you put in to this post. Very nice. I just have one possible improvement; kind of. I have been dealing more and more with a natural clay called calcium montmotillonite. There are numerous studies on this stuff and a lot of it has to do with champion Koi pond use among hundreds of other uses. They have found this mineral composition to be one of the biggest contributing factors in the "mud ponds" of Japan, where such massive filtration systems really aren't used or practical. It is proven to eliminate toxic waste products, bacteria and decomposed organic matter suspended in the water. I agree with the use of coarse and fine grain sand, but would urge more of us to use this mineral composition as a base layer.
This clay is of interest, but the more research the more questions

This is liberated from http://www.amazon.com/Microbe-Lift-...5?ie=UTF8&s=home-garden&qid=1208028079&sr=1-5
"It is said that the secret to Japanese healthy, colorful koi is the clay mud in which they are raised. This powdered clay comes from one of the highest calcium clay deposits in the world. Plastic pre-formed ponds, as well as vinyl, cement and rubber ponds, do not have any nutrients on their bottoms. In the wild, carp actually use mud to get many of their micronutrients and minerals. This product has a negative electric charge, which will bind the clay particles to positively charged toxins in the water. The clay acts as a natural flocculent and the particles that are bound up are filtered out of the pond. So the clay is not only a nutrient source for koi, it will also "polish" your pond water."
First they say it provides "micronutrients and minerals" and it's great for the fish. Then they say it will poison them. They don't give a replacement schedule.

Dr Joe
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