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UDV
04-14-2008, 11:47 PM
My LHBW had a sale on some older DAP (Diammonium Phosphate, it's white and rather shiny). A five pound bag was a little more than 2 dollars. I ended up getting a 1 gallon glass mason jar to put the stuff in. It's mostly in the form of fine powder, with some chunks that obviously got clumped up along the way.

I couldn't find anything in forum searches for this long term. How should you store this long term, under typical conditions? I put it in my glass jar and put in a cool dark place. This wasn't something I found online as far as storage. Is this one of the components that goes bad over time? Nothing I've read seems to imply that it goes bad, and as long as it is kept dry it will last for longer.

Does anyone have a long term advice about this. Will this one batch of DAP solve my DAP supply needs for the very long term future?

wayneb
04-15-2008, 12:34 AM
The data sheets that I have seen say that under cool, dry storage conditions, the shelf life of DAP is one year. I suspect that it could be kept longer than that under ideal storage conditions, but since it is not an expensive nutrient (when used in typical amounts), why not ensure that the DAP you use is relatively fresh by re-stocking your supply regularly?

Certainly a sale is hard to pass up, but if it is appreciably older than a year, I'd hesitate to use it.

Here's a link to an online data sheet for DAP: http://www.innophos.com/datasheets/Template1.asp?pid=3136

UDV
04-15-2008, 12:37 AM
Would it be really dumb to fill the same jug up with new DAP supply? is there some chance of the new supply getting old just by being in the same supply?

Medsen Fey
04-15-2008, 10:11 AM
According to Hightest, DAP can be stored 3 years (http://home.comcast.net/~mzapx1/FAQ/ShelfLife.pdf). Truthfully, if it doesn't get wet, I'm not sure that it can't be kept indefinitely.

UDV
04-16-2008, 07:15 PM
According to Hightest, DAP can be stored 3 years (http://home.comcast.net/~mzapx1/FAQ/ShelfLife.pdf). Truthfully, if it doesn't get wet, I'm not sure that it can't be kept indefinitely.


So I am covered on DAP for the next few months :)

Oskaar
04-17-2008, 07:31 PM
If your DAP is clumping you can always add a packet of dessicant to the jar to take on any moisture that gets in.

Cheers,

Oskaar

UDV
04-18-2008, 12:23 AM
If your DAP is clumping you can always add a packet of dessicant to the jar to take on any moisture that gets in.

Cheers,

Oskaar


Can you buy this somewhere? i mean can I just use a spare packet of dessicant from wherever taped to the lid?

GrantLee63
04-18-2008, 05:05 AM
Here ya' go:

http://tinyurl.com/5wmpcw

Toss a pack in the container you keep your DAP and you'll be good-to-go.

- GL63

wayneb
04-18-2008, 10:49 AM
BTW - Silica gel packets do eventually saturate, and then are no longer effective at removing moisture until they are recharged. Recharging is relatively easy. Just place the packet in an oven set at 300F for 3-4 hours, then carefully take it out and place it in a container that you can tightly seal (such as a glass screw-top canning jar) until it cools back to room temperature. It is then good to go for another dessication cycle.

UDV
04-18-2008, 01:38 PM
Heh, for three bucks? That's awesome :)
orders.