So, I have a question closely related to this one. I am considering using a plastic wading pool of 164 gallons to mix salt water for my 125-gallon tank initial filling (precycling). After that, I figured I could use 25-gallon buckets with my auto top-off and my weekly top-off and cleaning. Considering it is precycle, and I am running my ro di through it, do you think it is safe, or do you think there is the risk of contaminates affecting it?