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i think your question is kind of confusing, DTPA is a chelate iron, which works better in both low-high ph. DTPA shouldn't be added in a big amount, 0.05 ppm per day of DTPA Fe should be good starting point or even less, DTPA doesn't add any sulphate but i think it does add some Na (sodium). you are not adding any traces?

am still confuse about when you said your chemist gave you DTPA without any Fe.
 
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