Un-screw the entire top valve unit. I would duct tape over the top of the riser pipe at the top.You do not want to get any sand inside that pipe. Turn upside downand rinse out completely. Add new sand remove duct tape and replace top valve unit
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Un-screw the entire top valve unit. I would duct tape over the top of the riser pipe at the top.You do not want to get any sand inside that pipe. Turn upside downand rinse out completely. Add new sand remove duct tape and replace top valve unit