Replaced Granular Ferric Oxide (GFO) with 1 cup of GFO and cleaned reactor. Phosphate reading was up to 0.05 ppm from 0.02 ppm on 4/20. At this current regime, I am needing to replace GFO every 3 to 4 days. I am failing to see any improvements using the ZEObak (1 drop twice week) and ZEOstart2 (0.2 ml per day) after one week of usage. Still using Vodka dosing as did not want to totally eliminate all at once. I will expect to see improvements in both Phosphates and Nitrates after four weeks so lets see in a few more weeks.

Related posts:

1. Changed GFO Changed the GFO in the TLF Reactor as notice algae starting to increase growth rate and Hanna Meter, which started using this week, indicated 0.08 ppm PO4. Used about 3 cups....
2. GFO Changed Changed GFO today as PO4 creeping up....
3. Changed GFO and GAC Replaced Granular Ferric Oxide (GFO) and Granular Activated Carbon (GAC) and cleaned reactors. Used about 1 cup of GFO and 2 cups of GAC. Will need to cut down on GFO as took a big pH hit this time....
4. Changed GFO and GAC Replaced Granular Ferric Oxide (GFO) and Granular Activated Carbon (GAC) and cleaned reactors. Used about 1 cup of GFO and 2 cups of GAC....
5. Changed GFO Replaced Granular Ferric Oxide (GFO) and cleaned reactor. Used 1 cup of GFO. Switched out Maxi Jet 400 for 1200 to get better tumble as think that is reason GFO not lasting 14 – 30 days as it is caking....