One of the most important ways to maintain water clarity during the summer is aeration. Keeping your pond water constantly moving and oxygenated helps combat algae, keep the beneficial bacteria colonizing, prevent mosquitoes from breeding, and gives your pond fish the oxygen they need. Bad pond bacteria that break down debris into harmful gases thrive in an environment without oxygen. If your pond doesn't have enough oxygen, the beneficial bacteria die off, and the bad bacteria get to work. The gases the bad bacteria release are harmful to fish. These bacteria work slowly, creating a sludge layer at the bottom of the pond that turns the water murky when agitated.
There are different types of pond aeration. Water features like waterfalls and fountains help to circulate and aerate the water and are perfect for smaller and more shallow ponds. Larger and deeper ponds need more aeration. A pond aerator pumps oxygen directly into the bottom of the pond, and as the oxygen rises, it circulates the water. Keep your pond pumps and aerators running day and night during the summer to make sure the water is circulating and oxygenating.