DIY Replacement Guide: How to Replace Your Sand Filter Multiport Valve (Hayward Compatible)

The Multiport Valve (MPV) is the control center of your pool filtration system, but it is also a wear-and-tear component. Exposure to chemicals, UV rays, and constant pressure eventually leads to cracking or internal seal failure.

When your existing hayward pool filter valves show signs of irreparable leaks or functional chaos, it’s time for a full multiport valve replacement. This guide provides step-by-step DIY instructions and explains why TOT Valve is your best bet for a compatible, high-quality alternative.

I. When to Replace Your Multiport Valve

Simple repairs, such as replacing the O-rings or the Spider Gasket, can fix most minor issues. However, you should consider a full replace multiport valve procedure if you encounter any of the following:

1. Cracked Valve Body: Visible cracks in the main valve body that cannot be sealed.

2. Functional Leakage: The valve is set to “Filter,” but water continuously leaks from the “Waste” port (indicating a failed internal seal).

3. Incompatibility Issues: You are upgrading or repairing the filter tank and need to ensure your valve is compatible with pipe sizes (1.5” or 2.0”) and fittings.

For users needing a replacement for popular models like the Hayward sand filter multiport valve, ensuring the new valve perfectly matches the existing filter tank and plumbing is crucial.

II. Step-by-Step Guide: How to Replace Multiport Valve on Sand Filter

Here is the detailed DIY process focused on performing a seamless multiport valve replacement:

Step 1: Safety and Preparation (Power Off & Depressurize)

1. Crucial Safety: Turn OFF all power to the pool pump at the breaker.

2. Relieve Pressure: Open the air bleeder valve on the filter tank to release all system pressure.

3. Drain Water: If using a side-mount valve, lower the water level below the valve ports using the pump’s drainage plug.

Step 2: Disconnecting the Old Valve

1. Plumbing Disconnect: Depending on your setup:

   • Glued/Slip Connections: Use a PVC cutter or hacksaw to cut the connecting pipes, leaving enough pipe length on the existing runs for new couplings.

   • Threaded Connections: Use a wrench to carefully unscrew the unions or threaded fittings on the return and waste lines.

2. Filter Disconnect:

   • Top-Mount Valve: Remove the flange clamp band that holds the valve to the filter tank.

   • Side-Mount Valve: Unscrew the threaded fitting or union connecting the valve to the filter tank.

Step 3: Installing the New TOT Valve Replacement

TOT Valve specializes in providing high-quality, dimensionally compatible alternatives to ensure your sand filter multiport valve replacement is simple and reliable:

1. Alignment: Seat the new TOT Valve onto the filter tank. For top-mount models, ensure the internal standpipe is properly aligned with the diffuser tube inside the tank. Secure the flange clamp band or threaded fitting.

2. Clean & Prime: Thoroughly clean the exposed pipe ends. Apply PVC primer to both the pipe ends and the inside of the new valve couplings.

3. Reconnecting Plumbing:

   • Glued Connections: Apply PVC cement and quickly join the pipes to the new TOT Valve ports. Hold the connection firmly for 30 seconds.

   • Threaded Connections: Use Teflon tape on the threads before screwing the fittings into the new valve.

4. Cure Time: Allow the PVC cement to cure according to the manufacturer’s instructions (typically 2 to 24 hours) before pressurizing.

Step 4: System Startup and Testing

1. Set the new TOT Valve handle to the BACKWASH position.

2. Turn the pump ON. Backwash for 1 – 2 minutes.

3. Turn the pump OFF. Move the handle to the RINSE position.

4. Turn the pump ON. Rinse for 30 seconds.

5. Turn the pump OFF. Move the handle to the FILTER position and resume normal operation. Crucially, check all new connections for leaks.

III. Why Choose TOT Valve for Your Replacement?

When searching for a replacement for your hayward multiport or hayward pool filter valves, selecting TOT Valve provides a strategic advantage:

Choose TOT Valve for a dependable and affordable solution to your multiport valve replacement needs!