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You cannot go by what you took out of the tank that is in the bucket. A visual inspection of the tank is required to verify that there is no spots that would hold the previous product. I've pumped tanks dry and the product looked good and clean, but after doing a visual inspection the rust...

The outside being in real good condition gives you a fairly good idea as to the inside, HOWEVER, you have to remember that the main concern will be rusting and scaling on the inside at the bottom. That is where the sludge, water, and nasties have been living and where the deterioration will be...