Backflow Protector For spectra S9+
Do you sterilize the backflow Protector with the white membrane inside for spectra S9+ for the first time use? If yes, do u still need to sterilize for every subsequent use?
Do you sterilize the backflow Protector with the white membrane inside for spectra S9+ for the first time use? If yes, do u still need to sterilize for every subsequent use?

The manufacturer advice for silicon is to only sterilize them in hot water or steam. Best to avoid uv sterilizers.
The white membrane I never sterilise. The rest of the part yes.