I have access to a large SS tub I am considering storing RO/DI water in. It has a loose fitting lid and was originally designed as a wash tank (I think). It has never seen grease etc - only solvents like acetone and alcohol and DI water. No rust present. Not sure of the alloy but I might be able to find out. I like the idea because it fits the space I have and is easily modified for bulkheads and its FREE! Its about 15 or 20 gallons I think. Is there any problem w/ using this as a storage tank?