Last summer I had a pond built in my backyard. It was cemented in, and surrounded by blasted rock. It has a simple sump pump creating a waterfall effect.
Since the pond was installed, the water has at no time hovered around neutral ph. Our tap water in Victoria, Canada is perfectly neutral with little to no treatment. The water gets very murky quickly, and the PH creeps up to the 9 + level quickly.
When the pond was first built, it was cured (I don't recall how long), but then it was filled with water. The cement was not sealed with pond paint or the like. The first time I knew something was wrong was when I dropped in 8 fish, and they all died overnight. I tested PH shortly after that and I believe it was in the 10 range.
I subsequently drained the water, added new stuff and proceeded to dump muriatic acid into the pond for weeks to see if it would ultimately penetrate the cement and stabilize. That stabilization never happened (however the muriatic acid did bring ph down to 5 or so after each dosing).
Recently, my stone mason emptied the pond, and painted/sealed the pond with pond paint. I thought this would solve the problem as it was my guess that lyme from the cement was leeching into the water. It didn't solve the problem.
The PH looked to be close enough to 8, so I put more fish in. Fish died again.
Right now the pond has a lot of mosquito larvae breeding in it and I wanted the fish to deal with this situation. I cannot dump chemicals in to kill mosquitoes which will not kill the fish.
I am completely at a loss for why the PH is rising so quickly.
Please help. I am aware that the sump pump may not suffice in the long run as there is no biological filtration, but the acid in the water ought not to be spiking so quickly.
Since the pond was installed, the water has at no time hovered around neutral ph. Our tap water in Victoria, Canada is perfectly neutral with little to no treatment. The water gets very murky quickly, and the PH creeps up to the 9 + level quickly.
When the pond was first built, it was cured (I don't recall how long), but then it was filled with water. The cement was not sealed with pond paint or the like. The first time I knew something was wrong was when I dropped in 8 fish, and they all died overnight. I tested PH shortly after that and I believe it was in the 10 range.
I subsequently drained the water, added new stuff and proceeded to dump muriatic acid into the pond for weeks to see if it would ultimately penetrate the cement and stabilize. That stabilization never happened (however the muriatic acid did bring ph down to 5 or so after each dosing).
Recently, my stone mason emptied the pond, and painted/sealed the pond with pond paint. I thought this would solve the problem as it was my guess that lyme from the cement was leeching into the water. It didn't solve the problem.
The PH looked to be close enough to 8, so I put more fish in. Fish died again.
Right now the pond has a lot of mosquito larvae breeding in it and I wanted the fish to deal with this situation. I cannot dump chemicals in to kill mosquitoes which will not kill the fish.
I am completely at a loss for why the PH is rising so quickly.
Please help. I am aware that the sump pump may not suffice in the long run as there is no biological filtration, but the acid in the water ought not to be spiking so quickly.