how to replace sand in sand filter

1 ANSWERS

1. amomipais82
   

   There is a procedure for replacing sand in sand filter.
   Follow the steps below:
   
   1. The first step in changing your sand is to remove the old sand. To do this you will need to open the top of your filter. Filters with the multiport valve mounted on top will generally require disconnecting the plumbing running to the valve. If you do not have unions on these pipes, you will need to cut them to remove the multiport valve. (This would be a good time to install unions on these lines to facilitate future service on your filter.) Filters with the multiport valve mounted to the side will have either a small top which can be removed or a tank which is bolted/clamped in the middle that can be taken apart.
   
   2. If your filter is a two-piece tank which is bolted/clamped in the middle, you will want to pull the drain plug first to allow the water to drain before pulling the tank apart. Once you have pulled it apart, it is an easy matter to dig out the sand. This is best accomplished with a plastic cup - not a shovel! You need to be careful when digging not to break the laterals of your underdrain.
   
   3.If your filter is not the two-piece type but has the small opening at the top from either the multiport valve or cover, there are two ways to remove the sand. The first and easiest way involves filters that have a plug at the bottom that allows the sand to flow out. This is usually a larger plug and your winterizing drain plug is threaded into it.
   
   4.If your valve is side-mounted, you will have an overdrain which fills the opening at the top. This overdrain is removable and, most of the time, simply unscrews. You can then rotate the pipe it is connected to by moving it to the side and out of the way. There are some cases where the overdrain is glued to its pipe. In this case, you will need to rotate the pipe with overdrain out of your way.
   
   5.Once you have removed all the sand you will want to clean and examine the laterals thoroughly. Most laterals will unscrew, allowing easy removal from the tank for cleaning and examining. There are some laterals which snap in but these are only on two-piece tanks. In this case, you will be able to remove the entire underdrain assembly in one piece.
   
   6.Now you are ready to replace the sand. First, replace the underdrain assembly and then add water until the tank is half-full. This will cushion the laterals when you put the new sand in. After adding each bag of sand, reach in and level out the sand bed. You will need to add as much sand as the manufacturer indicates on the label on the tank. If the label is gone, use the chart below. Some labels call for pea gravel. However you can substitute sand in place of gravel if you wish. (Sand weighs approxiamatly 150 pounds to the cubic foot if the amount is in cubic feet and not pounds) After you have added the proper amount of sand, you will need to reassemble the filter tank and/or multiport valve.

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