I discovered today that I need to check my water levels more frequently as my plants grow. I noticed some withered leaves, so I check the water and it was below my root level. I guess now that the plants are larger, they are using more water. I need to check the water level about every 3 days. I rigged a long tube (50 feet) that runs from a laundry sink to my hydroponic bins. I have it routed through the ceiling in the basement. That works well for replenishing the water. My city water is about 7.0 pH level, so I always have to adjust the pH after adding water.