How can you change sand in a hayward filter for above ground pool?
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Remove the top, use a wet/dry shop vac, suck out all the sand. Be careful of the laterals that are buried in the sand as they are usually fragile so don't go shoving the hose down too hard. Once you get the sand out (you don't have to get every last grain) then put enough water in the filter to cover the laterals and gently pour in the sand. This will ensure it settles around the laterals properly and doesn't break them from too much weight.
You have to unbolt the top and take the sand out. If you un-hook all the plumbing it can be tipped on its side..but, if it needs to be changed it will be packed and you will have to use something to loosen it to remove. Be careful not to damage tank while removing. Stand back up and reconnect plumbing, then pour sand in. Good Luck!
I did this to mine 2 yrs ago...still working fine!
First of all, when you open up the filter be very careful when working around the inside of the filter. There is an assembly inside the sand filter that is called a "diverter collection hub assembly". This is an arrangement of hard plastic tubes with little slits in them for allowing water to pass thru but not allow th sand to pass thru. The sand will wear over time and may begin to become so small that it can pass thru the filter and circulate to the pool. The top of the filter must be removed to get access to the inside. If you cannot reach in to hand scoop out the sand then a wet/dry vac could come in handy. Do not use any hand tool to try and scoop out the sand as the lateral bars at the hub assembly are incredibly easy to break. The whole assembly is a couple of hundred dollars and it sometimes results in simply replacing the filter assembly. Why do you want to replace the sand? It is usually not necessary unless there is sand getting in the pool or there is a mechanical problem inside the filter. In 25 years I have only had to replace the sand because of mechanical problems or a new installation. If I were you, I would research the situation a little more as not doing so could cost you plenty.
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