esshup has it correct. For the coontail you should only add enough chemical to treat the water above the sediment layer. Once you get it killed ask OSU extension about putting in enough grass carp to keep it fairly clean. Don't put in enough grass carp to eat it all or the coontail biomass will be replaced by filamentous algae. You always need something in the pond to be consuming all the recycling nutrients. Nature demands that something will feed and grow with all those accumulated nutrients contained and trapped in the 36 yr old pond basin. Pond is very enriched as is evidenced by the amount of coontail that currently grows each year in the pond.
Last edited by Bill Cody; 03/25/26 02:24 PM.
