I have a large in home filtration system but lost the book on how to clean it properly can anyone give me some tips?? Answered

The cartridge likely needs to be changed, check out this latest guidance
https://watervariety4u.com/best-whole-house-water-filtration-system-for-well-water/

The cartridge likely needs to be changed, use this for guidance https://popular.reviews/whole-house-water-filters-for-well/#How_to_Change_It

Hi Darien,
I think this might be the unit you have...looks fairly similar to yours.
Good luck

Wow! I have never seen one quite like that before. It looks very black, and monolithic.

I am curious to know if you have looked under the sky blue cap on top of it.

I am kind of naively assuming there is a way to take the cap off. Also there might be some hieroglyphics, perhaps with the name of the manufacturer, underneath that cap.

Also the cap itself appears to have some sort of pictogram on it too. It is hard to make out from the angle the picture was taken, but the bas-relief pictogram on the cap looks vaguely like a smiley face, with water drop shapes for eyes, and a capital "I" turned sideways for a mouth.

I don't think its turns but its apparently under pressure so i have to shut off the water but which one the one from right here or the one outside either way it'll shut off water to the whole house but then what without a model # or manual idk what needs to be done

There would be a filter cartridge within. With no sign of any clips, so the lid should just screw off. Have you tried that, turning it anti-clockwise?