As the water evaporates it leaves behind the pollutants and debris.
Complete pond water change.
If your purifier struggles to deliver sufficient water for your pond you may have to look at buying a larger purifier or carrying out small water changes.
Replenishing the water lost from evaporation is not a water change.
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For koi ponds or ponds above 500 gallons in volume the easiest way to carry out regular water changes is with a pond vacuum with am automatic discharge function.
Partial water changes are key.
Less than perfect water quality can be vastly improved with water changes.
But how much water should you change out.
For example a 20 water change for a 10 000 gallon pond 2000 gallons will demand more throughput through a water purifier than a similar water change in a 5000 gallon pond 1000 gallons.
A complete water change is a huge shock to the pond and everything in the pond fish plants bacteria soil algae will suffer for it.
The goal is to reduce concentrations of dissolved compounds in your pond water.
Topping off a pond to compensate for evaporation is not considered a water change because no pollutants are removed in this process.
Generally 10 20 of the pond water is drained.
Well some pond owners say that up to 40 or 50 changes can be done without too much harm to the pond s ecosystem.