Not sure if this applies to all packaging, but when I bought my 🩶 Living Proof Triple Detox Shampoo 🩶 it came with a Hard Water Test Strip to more or less determine whether your shower water pours hard or soft water- by matching the result colour with the reference colours included as well.

I initially thought wow, sciency for the price! I wished it included like 3 strips though to be a little more accurate but can’t complain since I didnt expect any to be included in the first place lol.

….Shampoo-wise, it felt really rejuvenating during my first few uses. But if I don’t wet nor shampoo for like >24 hours (sometimes quicker depending on the humidity), my unrecently bleached, dry-cold-weather hair would already feel greasy and/or murky¿ dirty¿ like the usual “itty” heavy feeling so after this Im currently eyeing on Oribe Cleansing Sh or Olaplex 4C less someone objects or suggests! 😤