Suggestion?
Tie up one of each, put them in a bowl, check them,every so often.
This is not an acturate test on a stream, but would work for a lake test. Stream test would require a fountain or fish tank with constant rippling surface
Suggestion?
Tie up one of each, put them in a bowl, check them,every so often.
This is not an acturate test on a stream, but would work for a lake test. Stream test would require a fountain or fish tank with constant rippling surface
"Trust, but verify" - Russian Proverb, as used by Ronald Reagan