Have the BTBP 100 exchanged for the suction pump from Gardena since their 9m Suction busied and bereuhe only this is not already done more to have. Connected with PE pipe and pressure switches to operate reliably, without problems. I put the pump in a drain pipe in the 110s I slit suction holes with the angle grinder. The tube I have one leg in a Damenstrumfhose inserted and fastened, serves as a suction filter and working properly.