I do not know what that number represents. Either the manual, or a Technician will provide that info. Once regenerated, the unit will soften as much water as it can. Not to a lesser or greater degree, just whatever volume of a given amount passes through the resin bed. That volume might be 400 gallons, 800 gallons, or 200 gallons. I just can't tell you without knowing more. Once that given volume has passed through, the resin is exhausted, and now water coming through, comes out hard. Once it regenerates, it can soften that same volume of water again, and the cycle is repeated. They are not meant to be adjusted to make say 10 PPM, 20 PPM or whatever hardness level you want. They are meant to take a given amount of volume, take it down to 3 grains (51.3 PPM) (or less) Total Hardness for lets just say 400 gallons and start over. The bypass is designed to take the softener out of the loop if there is a problem with it, like it has a leak, needs maintenance, etc. It is not meant to adjust your hardness level. As for the regen time of day, 02:00 is default for all of them so you aren't as likely to call for water during a regen cycle. I can tell you with certainty that if you are regenerating every night something is wrong. Either you have too small a unit, and or it is not set up correctly. If your water is that hard, or you are using that much water, you should have a bigger unit. My guess is improper setup. Without knowing your softener size, your incoming hardness, and water use, I cannot tell you more about that, sorry. I really encourage to consult your manual, get a technician out, or both. You will tire of hauling and or paying for excess salt at some point if you don't get it set up properly.
