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A premixed remineraliser solution has HEAPS of salts in it, in the form of magnesium sulfates (epsom salts). It's so concentrated that bacteria can't live in those conditions. I don't think there is a shelf life on premixed remineraliser solutions.

No, unless you use up the whole amount in a week. The reason, I, (and I mean personally) don't like doing that is because, RO water having been stripped of chlorines and chloramines is very easy contaminated with bacteria (the bad kind, not beneficial bacteria). So keeping it premixed for too long can introduce bad "stuff" into the tank. Another partial reason is the waste water it produces. I like reusing it to water plants or wash things. I can only re-use so much of it. So making too much RO water has a greater cost in wasted water. There are probably other valid reasons other people might have. But make as much as you need to use in a week, and there will be less waste.

Just remember to use pure RO water (not reminerised) when topping up from evaporation BETWEEN water changes! I agree with JayC but I do mine in 2 week batches (so it is used up in just over a week) and then keep it in 1L bottles with caps on, though I use the zerowater jug (incidently there is NO wasted water with this jug RO method). Simon

From my years of playing around with tap water, and from what I have read, and thats a lot, the only assumption I can come too is that you don't know what is in tapwater (TDS) and it can be changed by the water company/source without you knowing. I assume you read my tapwater thread where the TDS/parameterts were perfect with our tap water for Taiwan bees but they never survived, but by using the zerowater filter jug producing RO alternative water and remineralised water it has been plain sailing all the way since. I do use tapwater for the cherry shrimp and they are more adaptable (although I believe they would probably do better with remineralised RO water all the same, I posted a video on here that suggests that from a Pro) and survive without any problems. To summarise, your blues should be ok in tapwater, but as you don't know what is in the water then it is a risk from the start. If you use RO water and remineralise using a shrimp specific product then you KNOW that everything the shrimps need is in the water and will always be the same! Simon