Aquaponic Chemistry

I did a water test of my ponds chemistry this morning.

From left to right PH=8.0, Ammonia=0, Nitrite=0, Nitrate=0, Phosphate=5
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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