I grew up with a 24ft above ground. Dad used liquid chlorine. Never had a problem. We just got a 16ft intex type given to us. I got it up and didn’t short cut set up. By that I mean I leveled and used sand and used a laser level. It has a sand filter not a cartridge type. I thought after 30 yrs. the chlorine tablets would work. To make a long story short I wasn’t getting any chlorine in it using a floater. So put tablet in skimmer and ran filter all day. Go out this morning and it green. Test it NO chlorine. I guess I need to use liquid.