Small ponds have always an ...

Small ponds have always an issue for Algae. The main reason for algal development is sunlight and stagnant water. To avoid the growth there are enzymes available in the market for which the algae is nutrition. Further you need airation, have a floating fountain in you pond. this will help you avoid water becoming stagnant and there are much less chances of algal growth than. Further more to both of the above, you can have a floating garden in your pond which behaves as a ecosystem and the algae will be its nutrient. This is a very effective technique but you need to be very specific in selecting the floating garden plants. But to go for any of the above solution, your pond data as in quantity, quality of water, region, etc are very imp factors.