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?

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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.