May I know if someone know about this tiny plankton shrimp like creature in spring mountain water? I know ( traditional ) if there is leech in spring water it means it is very good to drink but it is not like leech but it is like shrimp
This is most likely Gammarus Pulex or "Freshwater Shrimp"
I don't believe they are anything special in terms of working out whether water is potable or not. They tend to prefer slow-moving, highly oxygenated water, but that's about it.