I purchased a 48,000 grain system, figuring our water would be 30 grains/gallon for about a third of the year. However, a different water company representative tells me that this is not so, and our water is around 10 gpg (though it is likely higher than 10 in reality).

Figuring we use 90 gallons/day (which is a little high), the water is nearer to 13 gpg, there are three of us, and the water regenerates every 8 days, plus 10% for a "safety net," I am getting closer to 31,000 grains required.

Anyway, while I plan on monitoring the water throughout the year (especially during summer), I was wondering, what are the downsides to this? How can I mitigate the effects of too large a system? Thank you in advance for any information!