Models of main drain grates advertised and sold as being in compliance with the “Virginia Graeme Baker Pool & Spa Safety Act,” may conflict with water flow and velocity requirements of the “Florida Public Pool Code,” 64E-9 FAC. A provision of the federal law requires that by December 20, 2008, every public pool and spa, both new and existing, be equipped with drain covers conforming to the ASME/ANSI A112.19.8 – 2007 Standard. The standard requires drain covers be stronger and less susceptible to degradation caused by heat, light, chemicals and age.

This is commendable. However, making the main drains stronger has necessitated that there be less open space or “holes” for water flow. Some of the grates recently introduced, or being advertised as coming to the market before the compliance deadline, have approximately 50% less open space and similarly half the gpm rating as the old model grates had before they were beefed up. When the same size “new and improved” grate is installed, builders and engineers are faced with the dilemma of maintaining the proper water level in the collection tank without increasing the water velocity at the main drain greater than the maximum allowable l.5 feet per second. If the open area of the grate is too small, there may not be sufficient water in the collection tank for the system to operate properly. Eliminating a hazard creates a new problem.

On new construction this is easy to remedy with larger grates or multiple main drains. There isn’t an easy fix for existing pools and spas. Contractors are cautioned to be aware that newly introduced “compliant” drain grates may not be in accordance with current requirements of the Florida Public Pool Code. We recommend that you check with your Professional Engineer as well as with the Department of Health official in charge of plan review in your area before changing drain covers.