I have a small pond in the garden which I dug over thirty years ago when my son was little. I am in no way a pond enthusiast as such although I love to watch the wildlife it contains. It is completely natural with no pump or other equipment but the water is brown. A few months ago, I repaired a couple of leaks and topped up with tap water and it remained clear for a few weeks. I’ve now tried to clear the water with Blagdons Pond Clear but it has made absolutely no difference. I mixed the required amount in a watering can with water from the pond and applied through a rose. I’ve now treated the pond three times but to no avail. Any ideas?