i like the clarkes pump, use washing machine water hoses for your 4040 system they great and cheap, no leaks
Plus i use a water pump box for extra hoses, or delivering from a tank
after the pump has pushed water through the membrane it only has a slow flow so you need a pretty good pump the optmium pressure to make your membrane last is 150psi which would give you a great flow rate enough for two poles at least, i have 6 jets on mmy brush!
Thats about as big a clarkes 1200watt self priming pump comes in cheap so good choice id say
ive seen it selling online for 75.00 pounds, you get more water and better water so it saves you replacing expensive crystals in the membrane filter, saves you money, sounds ok too.
i would love to know what the put the water pump box, ie the specs on the pump and the battery please