Ok I am learning about this and didn't really understand about CSV's I think I do now.

I have an older 85 Gallon Sears tank and a newer 3HP 25Gallon Pump. The pump really only runs for about 30-40 seconds which I understand is too short.

My initial thought was a second tank, but now I wonder about a CSV.

I see that the main pro of the 2nd tank is a bit more reservoir when I loose power in winter, which is infrequent.

The main pro's of the CSV is cost. and less floor space though that is not a big issue.?

Installation is probably similar.

Both would likely do the job.

Anything else I should consider?