Measuring Rowaphos effectiveness for the purpose of Algae Control

[jostafew]

Hey everyone, I know that in order to verify the really low concentrations of Phosphates that SPS keepers are after a Hanna low range checker is the only way to go. However, if my only goal at this point is to reduce Phosphate levels low enough to eliminate nuisance algae growth will a Salifert test kit reading zero be sufficient to indicate that the Rowa in my reactor is still functioning adequately, or will the amounts slipping by that test kit due to Rowa reaching saturation be sufficient to sustain the algae problem?