hundreds of caterpillar-like bugs in runoffl under 30x

i was getting ready to test runoff ph and i noticed hundreds of caterpillar looking bugs in runoff water. they are rather small and can be seen with naked eye. a 30x microscope was needed to identify the looks. any ideas?

how about a micro-picture?

looks like fungus gnat larvae. they feed off of dead tissue in the root system. If you see little fruit fly-like gnats in your room then thats most likely your culprit. the best treatment for gnat larvae, or any other type of small crawly worm-like larval creatures, is Bacillus thurengensis. Also called BT or Gnatrol.

thanks for the reply. i ended up having ph issues also so i flushed the soil with a few gallons of water (to wash away any salts or critters) i then added permethrin to water and flushed with that. let it sit for a minute then flushed with more water. plants took it fine.

i appreciate the information.