EZ7821 Total Phosohorus, 0.005-1 mg/L TP EZ7822 Total Phosohorus, 0.01-2 mg/L TP EZ7823 Total Phosohorus, 0.025-5 mg/L TP EZ7824 Total Phosohorus, 0.05-10 mg/L TP EZ7825 Total Phosohorus, 0.1-20 mg/L TP EZ7826 Total Phosohorus, 0.5-50 mg/L TP