turn you multi port valve to back wash before starting filtration.
If your pump is throwing sand back into the pool from the filter, you more than likely have a cracked or broken lateral (finger). To check, remove all sand from you filter and pull the center pipe and laterals out of the tank and check all pieces to make sure there are no cracks. If a crack is found, replacements can be purchased from you local pool store.
You did not cover the stand pipe at the top of the filter. Try backwashing a few times and monitor the amount of sand returning to the pool. If there is less coming back you may not have to do much more. If it continues but only slightly diminished then you may have to remove the sand, remove the stand pipe, check the laterals for broken parts, replace if needed, clean the area at the base of the laterals where the stand pipe threads in, install the stand pipe, cover the top opening of the stand pipe with tape or a plug, add water to the tank - to about half full, then add the #20 silica sand - no other grade sand will work. The rest -- you already know how to do.
What is a normal operating pressure for a jacuzzi sand filter for an above ground pool?"
Unhook battery ground, get under car with the two correct wrenches and remove the filter. Drain gas into a pan( not a lot gets out). Install new filter.
yes, you can turn a pool into a giant hot tub.
Is a sand filter system or a saltwater filter system for above ground pools?
Install a new filter
This question depends on where the one asking the question is located. Jacuzzi spas may be purchased from independent retailers in your local area. They will be able to give you advice based on ground conditions and will also be accessible to you should something go wrong.
Probably not going to be adequate.
In most cases it is due to not changing the fuel filter every 15,000 miles. In some cases it is a bad ground or the connector in the tank at the pump.
Vacuum them into the filter.