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Coldwater, Michigan | Pump all you can get. Then if there isn't a manhole in the tank you can try injecting water a few times, then immediately suck it back out. Idealy you would have a way to circulate the water. Draw from bottom, pump over the top abck into tank for a while, then immediately pump it out of the tank. or if you had 2 holes in the bottom, out one, into the other. However, if you have a manhole, when you get it pumped down sholvel it out with a scoop, or something else. It is safe to spread on the field, in most cases. In most cases it is also dsfe to get into the tank. If there has been a high percent of nitrogen in that tank, you may want to take a breathing mechanism with you, or find a good way to ventilate while in the tank.
Depends on the type of tank, and the material that has been stored. I have been in tanks with powerwashers in the past. Plastic tanks with holes open and powerwash the crap out.
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Polyphosphate overwintering?
