The seasons, sun, rain, and wind, plant growth and fish, as well as environmental factors all have an effect in the constant change of your pond environment. The water in your pond can be regularly tested to reveal the condition of your pond. You can do this yourself simply and fast with Oase practical and reliable Test Sets and Quicksticks. You can find everything you need in the extensive Oase Activ pond care product range from oxygen stabilisers to starter bacteria and valuable vitality supplements. All of these treatments support the balance in the garden pond eco system and make it easier for the filter system to work on providing healthy, visibly clear water.