On the smaller HOME systems, the running pump may cause the water to become warmer than is good for the plant. Temperatures of up to 24 or 25 degrees are not harmful to the plant, but you should keep a close eye on the leaves. As long as the leaves look healthy, there is no need to worry. To maintain the ideal temperature of 21 degrees evenly, a cooling unit (chiller) must be integrated into the water circuit. A more favourable method is an interval timer, which is set as follows: 1 minute pump on, 5 minutes pump off. This recommendation has been tested several times and does not harm the plant in any way. The water is so saturated with oxygen that even 1-2 hours without oxygen production will not harm the plant in an emergency.