This unit works surprisingly well . Arrived without any paperwork of any kind in box . Had to search and search to find instructions . If I were to make improvements I would put a sticker on the reservoir tank for type of fluid required . Again, took forever to find info . The small wires going into controller need a rubber grommet of some type to keep out rain , as it is very open at the small wires. Overall I do like the unit and plan to purchase another .
Cindy Ryan. 
