I've installed micro irrigation, as:
water butt > pump filter > Shurflo 30psi pump > 16mm supply pipe > 4mm pipe > emitters
Have seen others mention dirt can enter the emitters & eventually backflow to the pump. It seems either an inline non-return/check valve or inline filter would be suitable on the pump output, but the budget only allows for one. Are either really needed, and which connector would be more beneficial?