po4 photometer says my ro/di is at .49 mgl

[joe blo]

how is that converted to ppm? this is with new filters and membrane.

[cabrego]

if you mean mg/l that is equivalent to ppm.

.49 is awfully high after ro di. Are you sure all your filters are new? What is your TDS reading? I would do another test to verify the result.

[bertoni]

Something seems to be broken. Which brand and model of photometer are you using?

[joe blo]

i'm using the $200 hanna photometer. i just tried wiping down the cuvet and now the reading says .01. thanks for the help guys

[beeper man]

Did you test RO when the system was new? Some systems just can't take it out. Especially the home drinking water systems.

[joe blo]

yeah i just swapped the membrane, sediment,carbon,catalytic carbon, and 2 de-ions