Sound like the laterals are wearing out these are the spokes at the bottom of the sand filter after time they wear out and don't stop the sand any more they will need replacing.
If you have a sand filter your laterals are worn these are the spokes at the bottom of the sand filter that allow water through but not sand.
how do you clean jacuzzi sand filter, and replace sand
distinguish between slow and rapid sand filter
If the sand in it has been there too long it may require replacement. Or the sand filter is not set to recirculate and not to filter.
Nothing if its a sand filter However if sand is coming into the pool from the filter then you may have to replace one ore more laterals in the sand filter as they have worn and are letting sand through to the pool,
It depends on how large the filter is.
Do you mean how do you install a sand filter?.
Change the sand in your sand filter every 8-10 years! :)
You don't . You chlorinate the pool with chlorine . You filter the water with a sand filter.
In order to do this you will have to have a spa pump, filter sand and PVC piping. The sand filter will provide you with years of enjoyment of your Jacuzzi.
differentiate between slow and rapid sand filters
for medium size filter you need about 100 kg