Tuesday, March 20, 2007

What is the right water temp for bio filter to start after winter season?

Your bio filter actually never shuts down, it just gets very efficient. This is due to the fact that cold water holds more oxygen, which is required to turn Ammonia into Nitrite and Nitrite into Nitrate.

There will be a significant less amount of Nitrifying bacteria in the filter itself, because Koi's metabolism slows down to a crawl in cold water. As the water in your pond gets warmer in the spring, the number Nitrifying bacteria that live in your filter will increase.

If you shut your filter system off in the fall, the bacteria would have all completely died off by now. It will take 4 - 6 weeks for Nitrosomonas and Nitrobacter to grow back.

Make sure to test your water frequently to check that your filter is working properly and there isn't an increase of Ammonia levels. Don't forget to do a large water change in the spring too. The oxidization of Ammonia and Nitrite by Nitrifying bacteria liberates Hydrogen Ions, which will lower you pH. Over time this will diminish the carbonates in the water, which could lead to a pH crash.

No comments: