Hello ALL!!

Today I was helping a friend clean out an old barn and we came across a kinetico water softener its a 3 tank system with a salt tank. I was wondering if this would still be usuable? the tanks are pretty heavy 100 plus lbs. I didn't inspect it much but i do know its a kinetico, where might i find a model type or number on the unit? I have looked through some of the forums and looked at a few pics tonight and haven't came across a unit that looks the same yet. This unit has been sitting in storage for at least 7 yrs plus and when we moved them I think i heard some water slush around in them. I'm mostly curious to if this system would still be okay to use since it has been stored (possibly with water left in them) might try to take them off his hands!!