Ah, just when you think everythings going fine. pump etc has been great for ages, then im at this job, and the pump/water flow keeps stopping for a few seconds, then starting/flowing again. Took pole to van and watched, it kept dead ending (blue light) and then coming back on a few seconds later. havent a clue what this might be. i know the battery was charged, and its a fairly new battery anyway. Not at all like the old airlock problems used to get. Wonder if anyone come across this before. Be great to hear, many thanks, kev.