Backwash the filter, drain water from motor etc., remove the dome on the top of the filter. I usually use a shop vac and vac the sand out, not overloading the vac. When all the sand is removed, check the laterals and piping in the filter for cracks, etc. I like to spread washed pea gravel or small rock under the laterals to help support them. Then add about 6 inches of water in the filter. Be sure to get sand of the right grade for a sand filter. Fill it with the recommended amount of sand, smoothing it to keep it level and around all fittings. Do Not fill the filter all the way. There needs to be space between the sand and the top laterals. Close the filter with the dome and be sure to inspect the o-ring on the dome. Put the backwash valve in the backwash position and backwash till clear. Put the valve on "filter" and open the air release valve on the top of the filter to bleed the air and start the pump. The pool may cloud a little but don't worry about it. It will clear as the sand compacts. It is a very labor intensive job...
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Backwash the filter, drain water from motor etc., remove the dome on the top of the filter. I usually use a shop vac and vac the sand out, not overloading the vac. When all the sand is removed, check the laterals and piping in the filter for cracks, etc. I like to spread washed pea gravel or small rock under the laterals to help support them. Then add about 6 inches of water in the filter. Be sure to get sand of the right grade for a sand filter. Fill it with the recommended amount of sand, smoothing it to keep it level and around all fittings. Do Not fill the filter all the way. There needs to be space between the sand and the top laterals. Close the filter with the dome and be sure to inspect the o-ring on the dome. Put the backwash valve in the backwash position and backwash till clear. Put the valve on "filter" and open the air release valve on the top of the filter to bleed the air and start the pump. The pool may cloud a little but don't worry about it. It will clear as the sand compacts. It is a very labor intensive job...