1 ml (20 drops) per 10 gallon rez. Use regular Clorox, the one for domestic use.
Fungus Gnats also seem to hate the bleach, as well as other critters that feed on roots.
Best,
Ojo
Thank you x100000.
Really only 1ml/10g?! That's so little. Are you sure that's enough to kill algae, slimes, pythium etc?