Shower pump and tray combinations

Having just been to B&Q this morning and failed to find the right sort of replacement waste system for my own shower, it looks as if there are shower trays and waste systems specifically designed for power shower applications. The magic figure seemed to be 30-something litres/min. Any idea what you expect the output to be from your pumped system?

Nick

We fitted a shower (with switchable, large, rainfall head and normal, flexible hose head) into a cubicle with a low tray (about 15mm deep), although the bottom rail of the door opening does add a further 10mm), as my wife is disabled and so low is good. The shower is supplied by a Grundfos pump with a capacity of 50-odd litres per minute at low pressure, but more like 20 lpm with the back-pressure of the shower.

I fitted a hi-flow waste, rated at 31 lpm. As long as the trap is cleared of hair every couple of weeks (there are 5 of us), it works fine. Even if it does start to clog, the water level rises a little, but that increases the outflow, so it doesn't get too high - and you get a few days' warning to clean it out.

Same sort of experience here, though not with a hi-flow waste and a Stuart Turner, I think it's a 2 bar one. That gives a very adequate flow through a standard (not rainflow) head, if you have to throttle back slightly against rising water level that's the sign that the pipes need clearing. I don't have an accessible trap, but one of the low profile "smooth bend" types. I use a hand-pumped "blaster" to clear it periodically, sometimes adding some bleach or sodium carbonate overnight.