CYA is to be measured back turned to the sun
but often have no sun
bought a cheap Garrity 3AAA 30 lumen flashlight
seems to work well, shine it through the liquid at an angle toward the black spot
can hit 50ppm most often with the CYA standard 50ppm
but often have no sun
bought a cheap Garrity 3AAA 30 lumen flashlight
seems to work well, shine it through the liquid at an angle toward the black spot
can hit 50ppm most often with the CYA standard 50ppm