What is 3 stage biofiltration ?

When you keep koi or goldfish in a pond, these fish eliminate waste chemicals ( ammonia ) from their bodies into the water. If these wastes are not processed and accumulate, their toxicity affect the health of your fish. This is why biofilters are installed in a fish pond. Even if you filter the water to eliminate fish droppings and your water is clean, it could still be toxic. A newly installed biofilter takes weeks to months to mature. This process involves the gradual growth of 2 types of bacteria which convert ammonia to nitrite and then to nitrate. This is the first and second stages of the process. The third stage is the utilization of nitrates by plants. If you don’t provide enough plants in your pond to balance the nitrates, your water turns green with algae. If you install ultraviolet light sterilizers to kill the algae, the nitrates build up and can predispose your fish to bacterial disease. You need to perform frequent, large water changes to reduce these nitrates.
      By using Pond'toons in a koi pond, excellent nitrate and phosphate uptake occurs, balancing the nutrient cycle. This creates an environment for both healthy koi and luxurious plant growth.