Convinced of a link between GFO and Cyano (and not the good kind)

[asylumdown]

Gfo is like any other product, the amount you "need" to keep phosphate levels at a certain set point won't ever be determined by tank volume.
It will be determined by the rate of addition of phosphate. You could have 10000 gallon tank with three fish and brand new ceramic rock, and you'll probably need less gfo to keep phosphate at "reef" levels than a 300 gallon tank with 40 fish and 7 year old rock. Whether "less" means smaller volumes changed more often, or huge quantities changed every 3 months, the amount you need is dependent on the amount you use. Just like carbonate or calcium.

Gfo can certainly reduce phosphate levels. My... Question (I guess?) is whether gfo can reduce phosphate levels to the point where the extra iron, in some cases, doesn't negate that benefit.

[TimT]

Foz Down alone can remove phosphates to the point(150ppbillion) where it is not reliably tested by most electronic meters, meaning the meter's margin of error is greater than the phosphate level. With Foz Down there is no need to use GFO and suffer with the other issues that GFO and reactors bring along.

Wai's should have 10 micron 4" diameter filter socks.

[asylumdown]

Originally Posted by TimT

Foz Down alone can remove phosphates to the point(150ppbillion) where it is not reliably tested by most electronic meters, meaning the meter's margin of error is greater than the phosphate level. With Foz Down there is no need to use GFO and suffer with the other issues that GFO and reactors bring along.

Wai's should have 10 micron 4" diameter filter socks.

He didn't seem to, but none of the socks I saw there listed the micron size. He didn't think any were smaller than 100 micron.

[MitchM]

They are the 10 micron socks at Wai's.
They're the same ones I got from Tim.