It is important to keep in mind that algae grows very quickly in the Summer as a response to warm and sunny conditions. This algae growth is supported by the presence of high levels of nutrients in the water that may come from fertilizers, grass clippings, urban runoffs or animal waste entering the pond.
If you want to control the growth of algae, you should look at reducing source of nutrients.Because of Summer weather conditions, controlling algae is harder and as a result, ponds need more treatments to prevent the growth of moderate blooms.
Moderate blooms of algae are generally beneficial and not a concern for the pond ecosystem but large blooms can cause fish kills later in the Summer as the algae decomposes and remove the oxygen from the water. It is important to avoid blue-green algae (cyanobacteria) that unlike many other types of planktonic algae, it causes odors, surface scums, and sometimes toxins that can be dangerous to animals and humans.
Algae blooms usually disappear in the early Fall, clearing up the pond very quickly. However, if you want to control the growth of algae we recommend:
1. Reducing fertilizer applications within 50 feet of pond. Remember, NO fertilizer June 1-Sept 30 to save the Indian River Lagoon
2. Keeping grass clippings away from pond
3. Do not overfeed your fish
4. Installing an Aeration device to reduce algae growth and provide more oxygen to the pond
5. Pond Maintenance (adding bacteria, enzyme or herbicide products) to control algae growth, especially during Summer months
Remember that algae is a part of nature, and an important part of the pond ecosystem! The main goal in keeping clean water is not to attempt to completely get rid of your pond algae but to keep a balanced ecosystem! So don’t stress too much about fighting it, control it by avoiding excess of nutrients!
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