Our local marine store now sells bottles of :"Battery Equaliser" (not cheap). It is supposed to reverse or prevent sulfating. This product has been used by some list members . I am somewhat confused from the instructions which state to add 1 oz per cell every five years but also implies to add the stuff when the battery is new. What have experienced list members that use the stuff been doing? Add when new or add after a few years? And what were the results. I just spent $250 on two new size 27 INTERSTATE marine deep cycle batteries and want to do the best thing. Thanks in advance for your good advise, George of Scaramouche in Lake Ontario