bath melts, PsaltyDawg asks: I have been hesitant to make/sell any bath bomb truffle type products because I am concerned about what happens to so much unsaponified hard butters when they get into the drain. They will harden up and coat the pipes eventually causing blockages or slowdowns. Do you have an opinion or a science-based explanation for how that would or wouldn't occur? I would really like to use them and sell them but don't feel I can.
In the recipe I posted, we use 1 part citric acid, 2 parts butter, 3 parts baking soda. If you had a 100 gram bath melt - which I think is way too much - you'd be using around 34 grams of butter. That's around two tablespoons or a little more than one weighted ounce. That's not a lot in 80 litres - 20-something gallons - of bath water. It's liquid when it goes down the plughole, and it'll be in the sewer pretty quickly after draining.
On a similar note, I've been using my emulsified scrub in the shower for years and years, and it's never occurred to me that this might be an issue. My scrub is basically lotion when I rinse it off, and I would imagine it will stay that way for a while. If you're worried about the melts, consider adding a bit of emulsifying wax to the recipe to make it more lotion-y.
This is just my completely uneducated opinion. Anyone else have an opinion? Any plumbers out there who have an expert opinion to share? (My dad was a plumber, but I know nothing on this topic. Probably less than nothing...) We'd love to hear it!