I don't know if it is any help, but we had a 30 x 16 x 4 foot koi pond that was plastic lined and we started by putting in dirt and let settling for a few months till clear then we put in vegetation from a small lake along with water lillies and I used the water to start seedlings each spring and every winter when I cleaned it out there was usually a couple wheelbarrows full of vegetation that I put in my compost and it worked great. I never needed nitrogen for the garden when using this stuff. During the summer the underwater grass and vines grew so fast that I usually harvested another batch or two of vegetation every few months and the fish were fat and healthy. This worked for about 10years till we moved and as soon as our new home is built this summer I will definitely start another one. 8)
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