|I do have another product that is less costly than the Sprint.
This one is appropriate to foliar feeding of the plants but since it has some other nutrients in it, I’m not recommending it for use in the Aquaponic System water.
10% DPTA chelated Iron.
|Chelated Iron (+ other nutrients) For foliar feeding only.
Liquid 16 oz
|One teaspoon per 100 gallons to bring Iron levels up to 2.5 ppm
This chelated iron is better for plants than the EDTA that is more commonly used.
|For foliar feeding only, not recommended for application to aquaponic water directly|
|Liquid 16 oz $5.95 for foliar spray only.|
|Why use DTPA instead of EDHA?
Understanding iron Chelates
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|This Sprint 330 10% DPTA chelated Iron is what I have been using in my aquaponics systems for the past several years. I have regularly dealt with source water high in calcium carbonate that keeps my system pH elevated and causes my plants to suffer Iron deficiency if I am not supplementing with a form of Iron that remains plant usable at a pH of around 7.6. I do not advocate simply adding Iron all the time. Pay attention to your plants and learn the difference between deficiencies. Iron deficiency shows as new leaves yellowing but with the veins staying green at least at first. If in doubt there are iron test kits available. An Iron level between 2-3 ppm is all you really need and some source waters may be high enough in iron to provide plenty when combined with a good fish feed and a system pH between 6.5 and 7.0.|