2. Q Should my pond have a bottom drain?
A First of all, a bottom drain is essential for a healthy pond. However, if it is exposed and the suction is strong enough, fish can get stuck to it and not be able to get loose. Therefore, two drains should be hooked in series to relieve the pressure between them, just as in a swimming pool. Bottom drains draw falling waste from the fish before it reaches the bottom, keeping it clean. Areas where it does build up can be swept to the drains for easy cleaning. If you are using a submersible pump or pulling the water from a skimmer, water is not circulating properly on the bottom of the pond. That is where rotting debris is producing ammonia and other toxic gases.