GFO reuse

Peer.Boerner

Active Member
View Badges
Joined
Mar 8, 2026
Messages
112
Reaction score
93
Location
lakeland
Rating - 0%
0   0   0
I’ve been running GFO in my 43 Gallon (net) AIO for the last 4 weeks. Yesterday my phosphate level was 1.0 so I replaced the GFO with 1 Tablespoon of Rowaphos in a nano reactor. Today phosphate is at 0.06. I’d like to stop the GFO so the phosphate doesn’t go to 0.0. But the GFO is still likely not exhausted. Should I:

1. Just turn off the reactor and leave the GFO in it and turn on again if and when I need to? (If it clumps while sitting I’ll break up before reusing)

2. Save the GFO in a zip lock bag so it stays moist and use again in the future?

3. Throw it out. It’s only 1 tablespoon so stop being cheap.

Appreciate any guidance.
 

Randy Holmes-Farley

Reef Chemist
View Badges
Joined
Sep 5, 2014
Messages
89,464
Reaction score
92,741
Location
Massachusetts, United States
Rating - 0%
0   0   0
2.

Storing tank water without aeration (such as inside a stopped reactor) risks it becoming anaerobic and producing hydrogen sulfide.
 
OP
OP
P

Peer.Boerner

Active Member
View Badges
Joined
Mar 8, 2026
Messages
112
Reaction score
93
Location
lakeland
Rating - 0%
0   0   0
Thanks. So I can save in a plastic bag? I’d prefer that because I really would prefer not wasting where possible
 

TokenReefer

Valuable Member
View Badges
Joined
Oct 4, 2022
Messages
2,336
Reaction score
2,047
Location
across the pond
Rating - 0%
0   0   0
Yeah I always get a little worried if a reactor stopped and I get to fixing and that stagnant water comes out
 

Randy Holmes-Farley

Reef Chemist
View Badges
Joined
Sep 5, 2014
Messages
89,464
Reaction score
92,741
Location
Massachusetts, United States
Rating - 0%
0   0   0
Thanks. So I can save in a plastic bag? I’d prefer that because I really would prefer not wasting where possible

Yes, any container is fine. No need to be air tight, but drying out might close some pores.
 

Dan_P

7500 Club Member
View Badges
Joined
Sep 21, 2018
Messages
9,850
Reaction score
9,717
Rating - 0%
0   0   0
I’ve been running GFO in my 43 Gallon (net) AIO for the last 4 weeks. Yesterday my phosphate level was 1.0 so I replaced the GFO with 1 Tablespoon of Rowaphos in a nano reactor. Today phosphate is at 0.06. I’d like to stop the GFO so the phosphate doesn’t go to 0.0. But the GFO is still likely not exhausted. Should I:

1. Just turn off the reactor and leave the GFO in it and turn on again if and when I need to? (If it clumps while sitting I’ll break up before reusing)

2. Save the GFO in a zip lock bag so it stays moist and use again in the future?

3. Throw it out. It’s only 1 tablespoon so stop being cheap.

Appreciate any guidance.
Probably all round best to pitch used material.

The trouble with turning off the reactor is the possibility of bacteria growth and toxic hydrogen sulfide production.

If throwing it out will absolutely kill you, you might try rinsing it thoroughly in RODI, air drying it and bagging it. That’s what I would do, though I never had the inclination to. Maybe there is a better method.
 

TOP 10 Trending Threads

HOW DO YOU ADJUST YOUR CUC AS ALGAE DISAPPEARS?

  • Capture and re-home CUC

    Votes: 4 6.3%
  • Increase white light/hours in tank to spur algae growth to feed CUC

    Votes: 5 7.9%
  • Feed nori to support CUC

    Votes: 25 39.7%
  • Feed herbivore pellets to support CUC

    Votes: 19 30.2%
  • Allow attrition to balance CUC and algae

    Votes: 29 46.0%
  • Provide macro algae to feed CUC

    Votes: 6 9.5%
  • Introduce CUC predators

    Votes: 1 1.6%
  • Other (please explain)

    Votes: 5 7.9%
Back
Top