diy aquaponics diagram
I did a water test of my ponds chemistry this morning.
The pond has been established for about 7 years and is pretty much care free.
It always surprises me is now low my Nitrate levels are. Its a 1300 gallon pond containing about 70 pounds of fish which I feed 20 oz of food to every day. The Nitrates are being consumed by about a dozed 1 gallon plants in a stream (NFT - Nutrient Film Technique).
It might be because this pond has been established for so long, but it never needs any adjustments. I let the PH ride on the high side because its more about being a Koi Pond, and the garden is just a benefit rather than a product.
My Other systems are relatively new, and Im attempting to find a balance between fish and plants. The PH buffering has been a difficult obstacle, and I may reduce the amount of rock in these systems to see if it becomes less of an influence.
My newest system is a combination of gravel bed and raft. Im beginning to prefer raft systems over gravel, but I like the idea of keeping a little rock in the bottom of the raft tanks. If buffering continues to present a problem I will convert the gravel bed to a raft tank.
I plan to purchase a test kit for water hardness in order to make a better assessment of the buffering. Ideally I would like to keep my PH at about 6.8 in order to promote iron uptake by the vegetation.
Kobus Jooste wrote a very good article about water chemistry last year.
http://aquaponicscommunity.com/profiles/blogs/water-chemistry-aspects-to
Here are some more links:
http://chicoaquaponic.blogspot.com/2012/04/nutrients.html
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