@Randy Holmes-Farley I am running formalin/formaldehyde to wipe out an extremely stubborn Ich infestation (at a rate of 1ml Formalin / 10 gallons). One dose every 24-hours is allowing some noticeable return of symptoms, so I want to step that up to one dose every 12 or possibly every 8-hours. But it's a large tank and 20% water changes between doses is not practical more than once per 24-hours.
My thought is to run carbon for 2-3 hours at the end of and between doses, and stick with one 20% water change every 24 hours. Turnover flow rate in the sump is roughly 6x system volume. The carbon volume would be 1-lb / 100 gallons.
So my question is... Generally, how effective is carbon at removing formaldehyde? Do you think I can do this without significantly exceeding acceptable formaldehyde concentrations.
My thought is to run carbon for 2-3 hours at the end of and between doses, and stick with one 20% water change every 24 hours. Turnover flow rate in the sump is roughly 6x system volume. The carbon volume would be 1-lb / 100 gallons.
So my question is... Generally, how effective is carbon at removing formaldehyde? Do you think I can do this without significantly exceeding acceptable formaldehyde concentrations.