Pot Grids Better Drainage, No Blockages & reduces Root Rot. Growing crops with hydroponics is not easy. Save time, money and hassle with the best equipment by improving drainage and boosting root growth. Pot Grids are simple reusable plastic grids that are placed at the bottom of you grow pot. This simple introduction to your hydroponic system eliminates the need for a second pot, saving money, time and hassle. All you need is a single pot which is plumbed to drain, then place the Pot Grid in the bottom of your pot. Then we'd recommend keeping things simple so add a Pot Sock, add your growing medium and you're ready to grow.