Automatic Amiad Filter. aprox 10 yrs old but it works. Small leak at top (o-ring). No need for it any longer, saving watering. I have no manual on it but you can get diagrams and part number from the Amiad site. You can set the auto flush times easily runs on 120 volts..
Its a $4500 filter if you buy in new, was $2900 when purchased for my property. $250 OBO.
Email if interested and leave a number so I can text back