mold growth

[GOT MTS?]

I mixed up a 2 month supply of macros in a 2L Bottle and I'm getting mold. The mix is aqua vitro for N and dry ferts for P and K. I have a pump to dose daily.

Can I just add excel? If so how much?

[Aaron]

IME the mold doesn't seem to effect anything. I know Cavan mentioned he gets mold in his Flourish Nitrogen and hasn't noticed any ill effects.

[GOT MTS?]

Well I am glad that it wont harm anything however I am worried it will clog my dosing pump.

[Aaron]

In the future you could try adding 0.5 g of potassium sorbate as a preservative. It's pretty cheap on Ebay.

[GOT MTS?]

I saw some on amazon about a buck an oz. I was wondering if it would raise K.

[Aaron]

Yeah, it might add some K. Though I'm not certain you'd want to add any in large amounts.

[Jim Miller]

I didn't think there was ever any danger in adding K?

Jim

[Aaron]

I didn't think there was ever any danger in adding K?

Jim

I'm more not sure about the sorbate part of the equation.

[tug]

When using excel, I've used the recommended 25 mls per liter. Now, I find adding 0.4g potassium sorbate (about 1/8 teaspoon) to one litre of stock solution prevents mold. I screwed up once and added about 3 times that once without incident. What's interesting to me is that your trace isn't getting moldy. That's where I would expect it.

[GOT MTS?]

What's interesting to me is that your trace isn't getting moldy. That's where I would expect it.

I am dry dosing the trace.