Gfo question

[Proteus]

I am new to running gfo

My question is.

Is there a way to tell if gfo is spent.

My po4 was off the chart. To which I attribute my family feeding the tank twice a day. I was in aware of this so I fed in evening.

I have remedied the feeding schedule and done wc.
I know most People change gfo once a month or when they see a rise in po4

[ultreef]

Test the outlet of your gfo reactor. If it's anything but 0ppm then change it.

[Proteus]

Will do.

Wasn't sure if the outlet would be zero or if it was a gradual procedure

[Maverick00]

Will do.

Wasn't sure if the outlet would be zero or if it was a gradual procedure

Thats what i was thinking as well, Im not sure the water coming out of the reactor would be filtered to zero in a single pass. Ive heard every 6 months approx or when Phos starts to rise. I dont think there is any other way to tell as far as I know.

[ultreef]

Sorry my fingers were typing but my brain was asleep lol.

In most cases, no you will not have 0 phos on the outlet.

So a better indication would be when the outlet is at the same phosphate level as the overall po4 level of the system.

[e46er]

I change mine every 4-5 weeks

[freezetyle]

If you have high phosphates gfo can be exhausted in a very short time (days) so if your battling problems it might be a good idea to test ( from the output of the reactor) frequently to stay on top of the problem.

[gregzz4]

+1 to the above, and I'll add the same ...
Test your output, compare it to your system, and change your media every 4-6 weeks if all is good.
Keep a record of what's happening so you can keep an eye on when you initially need to change it and go from there.

[Proteus]

Thanks everyone.

I tested outlet and It is the same as tank. I'll change it today