There are similar pests in Korea.
I too have had trouble with containment in the past.
You can only see the effect if you use JWA in soft water and ginkgo biloba water (JHS) continuously. It is based on water hardness, not pH. You should use less than 25ppm water with the hardness crab sold on Amazon.
https://www.amazon.com/Hardness-Accurate-Softener-Dishwasher-Magnesium/dp/B08D8KFPV8?ref_=ast_sto_dp&th=1&psc=1
Please refer to number 10 at https://youtu.be/GobG1IJOLyo.
