Phosphate reduction not working.

[backbayreef]

Yep carbon dosing, dissolved in kalk to reduce no3. Was 20, It has taking time, i have also noticed a reduction in po4. I used to clean the glass twice per week, its now over a week when i see a slight film on the glass, po4 sits 0.003 Hanna, no3 is around 10 (salifert).

Just want to be clear and set the record straight (for others that come along later). Given the OP’s NO3 of 3.8ppm and PO4 of 0.69ppm, your recommendation is to dose more carbon source to reduce PO4?

 

[James CNM]

Just want to be clear and set the record straight (for others that come along later). Given the OP’s NO3 of 3.8ppm and PO4 of 0.69ppm, your recommendation is to dose more carbon source to reduce PO4?

Depends on the test kit. I disclosed what i use