Nitratreaktormedien: Schwefelperlen/Perlen Hauptquartier. 1000 ml
Sulphur Beads HQ. 1000mls (1.2kg). the calcium will buffer ph back to around ph7.8 - 8.2 depending on bio-load. A slow water feed is used to flow through the sulphur beads and allows anaerobic bacteria to grow.