Pond Boss Forums INTRO Questions & Observations Placing branches down for YP spawn

I would not be discouraged just yet. If the perch were in the pond when treated with alum there is a good reason they are not eating or hitting your bait.

Even if your PH is right your dissolved salts or electrical conductivity can be very very high. The water is like milk in away. It will not burn you or kill you but can strip paint off a table.

I am no expert on fish but when I treated my pond with alum and lime the fish disappeared for weeks. I could not keep a minnow trap in the pond with out it completely rotting to dust but my PH was 7.5.

Sulfur in water is very acidic as well as alum. I don't know how fast it would react with the fish's blood chemistry but it could take some time to flush the system.

Think back to when you caught the 30 if there was a weather event like high winds, heavy rain that could have flushed or diluted the pond water and temp.

Cheers Don.