Not sure how this would work, but you could run pipes from the barrels to the pump using splitters so they end up all heading to the pump.
Ive got a wcw backpack and its done me 3 storeys (ground, first & second).
Maybe add a controller unit to the list. Ive seen them on ebay from a company called 'crow electrical' for £69
RO isnt on the list ( or di if your di only)
A tap for your pole would be handy if your on limited water. Otherwise you would be spraying all over the place and loose alot of water.
Hope some of this helps
