Changing the sand in a swimming pool sand filter may sound like a daunting task. But, with a few steps it can be done and done safely, without paying a premium price to a pool company. This is certainly good news for those do-it-yourself people. With a few tools, some materials and a little time, this is one swimming pool chore that can be done.
The sand used in a sand filter for a swimming pool is the sand that is recommended by the manufacturer of the sand filter system that is being used. For example, the sand may be #20 silica sand that is 45 to 55 mm in diameter. The amount of sand is also determined by the manufacturer of the sand filter, this may be 175 pounds or so. A tarp to empty to sand on can be used and something to scoop the sand out will be useful.
Turn the pump off, then empty the existing sand in the filter system. To do this a tarp can be laid down under the filter drain and the filter drain assembly can be removed and laid on the tarp, now turn the pump back on. Turning the pump on will pump water through the filter out the drain hole, removing most of the sand in the filter. Another way to empty the existing sand is by removing the drain plug and allowing the sand and water to drain out of the filter. This method may take several hours.
After the sand has been removed, the multiport valve or the top dome will need to be removed, depending on which sand filter you have. If the sand filter being emptied is a dome style, the dome will need to be removed using a wrench. After taking the dome off, gently move the baffle/pipe and scoop the existing sand out of the filter.
If the sand filter is a top mount multiport valve system instead of a top dome, the pipes may need to be cut so that the multiport valve can be removed. After cutting the pipes, remove the clamp band that connects the multiport valve to the sand filter and pull the multiport valve straight up and off. So that sand is not accidentally spilled into the standpipe, be sure to cover it. Now get the sand out, this can be done with a shop vac or just with a cup. While doing this be careful with the laterals located at the bottom of the tank so you do not break or move them. Wash the remaining sand out of the tank, under the laterals, with a water hose..
Now that all the sand has been removed, replace the drain assembly. Put silicone sealant on the drain assembly threads. Use the water hose and add enough water to the tank so that the laterals are covered, this will help protect them from the new sand. Now make sure the standpipe is still covered if the filter system is a top mounted multiport. If the filter system is a side mounted system, then the intake baffle will need to be gently pushed out of the way or put a little plastic bag over the pipe to keep the new sand from getting in it.
Pour the new sand in the tank, being careful to keep the lateral assembly in place on a top mounted multiport valve sand filter system. Add a bag of sand then make sure the lateral assembly is centered in the tank. Only add the amount of sand that the manufacturer recommends. This is usually only about 2/3 of the tank, leaving a free board space. After adding the sand, lube the o-rings and replace the top of the filter. Double check the lid to make sure it is put on good.
Put the filter system on “Rinse” when restarting the system after replacing the sand, if the filter system is a multiport valve system. Now “Backwash” and “Rinse” one more time. Now the sand filter system is ready for the normal setting. In this way, Singapore swimming lessons will teach the adults to swim well in the pool. The movement of the hands and legs in the excellent.