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AW: AW: nitrate filter
Hi again Tyrone,
I understand the first part, not later:
> My friend has a 22 litre drum which gets fed a small portion of the
> return water from his sump/filter. This tum is so effective that it
> dropped the NO3- levels from about 40 mg/ml to about 20 after one
> week of operation. It is still going strong and keep the NO3- levels
> in his ~3'500 L malawi cichlid grow out system composed of 7 ~500 L
> tubs.
So far everything is clear.
>
> He turns that system over 4x every hour and has crystal clear water
> all year round inspite of lots of sun shine---
What do you mean that he turns over his system 4 times every hour?
> There was an article in AFM a while back on designing the optimum
> anaerobic filter. I think the specs were a 2 meter 5 mm tube with a
> flow rate of 2 ml/min...
Do you mean a 5 mm tube without filter medium in it?
2 ml/ min that means 2,88 litters per day. That is 0.76 gals per day. If the
figures are correct, you cannot effectively remove nitrates without having
many of these 2 meters pipes of 5 mm width.
>
> In essence if you want reallly GREAT filtration switch to a sand
> filter. Run the outlet the "dark box" with course filter medium and
> then through shell grit to neutralize any nasty H+ ions that are left
> over. I personally prefer the planted tank concept.:-)
That is a good advice. Yet my filter also works perfectly to keep nitrates
at zero. This time, I will measure the effects on phosphates and let you
know. I will also post a description including drawing of the components
once I got my scanner to run.
Tell me, do sand filters do not tend to clog and let no water flow after a
while? I dont know, I am just asking.
Erik
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