This guide describes the steps required to install a Hayward sand filter. The picture at left shows the two major components of a typical sand filter: the Filter Tank and the Multiport Valve and piping assembly. When installed, the valve sets on top of the tank and the vertical pipe the lateral assembly are inside the tank.
Before starting installation, you will need to purchase sand. Use only high rate No. 20 Silica Sand. An example is pictured at left. Check the manufacturer to determine the amount required. This unit (Hayward S180T) uses 3 50 lb bags of sand - 150 lbs total. You can also purchase our superior to sand Click here for our Sand Alternative.
When installing the pool sand filter, you will connect it right after the pump. Pool water will come in through the pool pump, be filtered through the sand filter and released to the chlorinator before returning back to the pool. If you have a pool heater, the pool filter will release water to the heater before going to the chlorinator.
The pool filter should be installed on a level concrete slab not more than 6 feet above the pool water level. Position the pool sand filter so that the piping connections, multiport valve and drain are convenient and accessible for operation and maintenance. Place the filter next to pump.
Before you connect the pool sand filter into the piping system, you have to assemble the filter. First screw the pressure gauge to the 1/4" hole on the side of the filter. If the threads aren't prepared, wrap them with two layers of Teflon tape. Start in a clockwise direction at the first thread with a half width overlap for the full length of the thread. Be careful when screwing the gauge on. Use a wrench on the square nut on the final turns.
Next you will be installing pipe and lateral assembly inside the tank. Separate the valve from the pipe and lateral assembly. Also make sure the 10 laterals at the end of the pipe are rotated up. They have to be in their up position to fit through the hole in the top of the tank. These laterals are somewhat fragile. Ensure that none are cracked or broken. Place the pipe and lateral assembly inside the tank.
Pour sand carefully into the pool sand filter until laterals are fully covered. For this unit 3 bags should leave at least 6" space between the top of the sand and the top of the filter. Level sand as you pour and make sure the center pipe remains centered in the opening. Be careful when leveling the sand that you do not lift the pipe and lateral assemble up off the bottom of the tank. You will not be able to push the pipe back down without causing the laterals to rotate up.
The next step is to connect the "PUMP" port of the multiport valve to discharge side of pump. You will need to screw a straight thread adapter (purchased at a hardware store) into the "PUMP" port. To help seal this connection wrap two layers of Teflon tape the adapters. Start in a clockwise direction at the first thread with a half width overlap for the full length of the thread.
Cut a short piece of pipe and glue it to the adapter. Make sure the pipe and inside of the adapter are clean. Gluing is a two-step process. First apply a thin but even coat of purple primer on each surface to be joined: the outside of the pipe and the inside of the adapter. After the primer dries, apply a thin even coat of glue to both surfaces. Immediately push the pipe all the way into the adapter and twist 1/4 turn to spread the glue. Wait 30 seconds for the glue to set.
Your new pool sand filter should now be ready to operate. Generally you would want to backwash the sand filter now, but if you have a new concrete of gunite pool, or have a large amount of dust or debris, start the filter in the "FILTER" setting initially (NOT "BACKWASH") to prevent clogging the laterals. After a couple of hours on FILTER, go to the next step and start the BACKWASH cycle.
Prime and turn ON the pool pump. Be sure that you have at least one suction and all discharge lines open.
Run the pool pump for 2 minutes after you have a steady flow of water out the waste line (after the pump is fully primed). This will flush all the impurities or fine sand particles out of the sand media.
Turn the pool pump ON. This is the normal operating mode for your filter. Note the pressure gauge reading. This is your clean sand filter pressure. As contaminates build up and clog your sand the pressure will climb. When it is 8-10 psi above your clean filter reading, it's time again to backwash your filter.