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Discussion Starter · #1 ·
I have been designing a simple solution to manually drawing out exact measurements of additives to dose every day. Basically, I will have 4 syringes of additives, and a 5th large syringe of H2O all in line, as in I will have them all connected to a main tube to dose directly into the tank in the outflow of the filter. By the way, the water is to flush out additives still in the tube after dosing the exact amount.

This all sounds fine, until I mention that the syringes are plastic. I plan to keep a week's dosage in them, and I am concerned about the additives reacting with the plastic. I don't think that potassium, iron, phosphorous, or micros will react, but I am also dosing Excel, which according to the bottle is polycycloglutaracetal, a derivative of glutaraldehyde.
In my organic chemistry lab we used plastic pipettes and funnels, but the compounds only came in contact with these for a short period of time.
I am concerned that leaving Excel in a plastic syringe for an extended amount of time may deteriorate the plastic or introduce contaminants from the plastic into the tank.

Does anyone have any insight on this?
 

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Discussion Starter · #2 ·
Now that I think about it, it IS stored in a plastic bottle...
 

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I use just one syringe to dose all the products.

I dose macros one day, micros the next.
These are stored in plastic jugs, not the syringe.

I actually have several syringes, many sizes, so I dose larger tanks with the larger syringe (really, it is a turkey baster) and smaller tanks with a smaller syringe.

I rinse the syringe (turkey baster) in tap water when I am done. It air dries overnight. If not, I suppose that messes with the dosing. The amount of problem is so little I do not care. What is a drop or two of water in 150 ml of diluted fertilizer? (the dose for my big tank)
 
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