It depends on who you ask and what you’re comfortable with. Depending on your disease state and risk tolerance, you may choose to sterilize after each use, others sterilize daily or weekly. I haven’t read of anyone going longer than a week.

For official guidance, I’d follow the manufacturer’s recommendations. Otherwise, you’ll hear everything from after each use to weekly and all points in between.

Personally, I use a baby bottle sterilizer with distilled water, generally once a day, though it’s not a hard & fast rule. Occasionally, I boil my equipment in distilled water for 5 minutes or so.

It’s also a good idea to replace equipment according to manufacturer recommendations, or if treatments start taking longer. Hope you’ll hear from others!