ag, vinyl,21x52 round aprox 9800 gallons, well water, 100 lb sand filter w 1/2 hp pump

my water is clean but it just doesn't have the sparkle. it seems a little dull. my chemical levels seem ok. I just backwashed my sand filter
shocked with liquid shock from the local pool store yesterday morn because of rain.

all I have is aqua test, test strips at the moment so readings are close
fc-10 ppm
cya-30 to 50
ph-7.8
ta-100
ch-350