For long term construction projects, a clean potty can help deliver, install and remove your holding tanks in your trailer. A holding tank needs pumped every few weeks or monthly. Depending on the size of the waste tank and the amount of water being used, frequent pumping is needed to empty them because solids and water build up in the tank. There is no drainfield attached to a holding tank. Every drop of water put down the drain in the trailer collects in the tank. Leave all the work to us! We will help from set up to break down.