leeching compost - The Planted Tank Forum
 
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post #1 of 8 (permalink) Old 07-31-2012, 02:09 PM Thread Starter
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leeching compost

hello, my compost is still leeching tannins after a month, when will it stop i am using bagged peat free organic compost
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post #2 of 8 (permalink) Old 07-31-2012, 02:53 PM
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What is the depth of the "dirt" and the depth of the sand cap?
>>>Many of us use 5cm (2") of Dirt covered
by 2.5cm (1") of Sand or very small pebbles as a cap.


Do you also have boxwood/driftwood in the tank?

What is your water change schedule?

These are all factors.
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post #3 of 8 (permalink) Old 07-31-2012, 08:33 PM Thread Starter
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ok, no wood as in big pieces but there is lots of bark, i think youve said it before, it depends on the type of organic matter in the 'dirt' i do 5 percent every day
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post #4 of 8 (permalink) Old 07-31-2012, 08:33 PM Thread Starter
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i cannot do big water changes cos i have the large tank upstairs '90 uk gallons
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post #5 of 8 (permalink) Old 07-31-2012, 08:34 PM Thread Starter
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will purigen work
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post #6 of 8 (permalink) Old 07-31-2012, 10:11 PM
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Yes, purigen will work.

It can take a month our two to flush out the tannins.The more water you can turn over the faster it will go.
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post #7 of 8 (permalink) Old 08-04-2012, 01:49 PM Thread Starter
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cheers dogfish, it could be the trace ferts turning the colour :s
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post #8 of 8 (permalink) Old 08-04-2012, 08:23 PM
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Usually it is not trace fertilizers. I know one product is dark brown in the bottle, but you use so little it does not affect the water color.
I am sure in your case it is the compost.
Ditto the above suggestions:
The material will keep leaching tannins for quite a while, but the more often you can change the water the more tannins you are getting rid of.
Purigen will remove them, and activated carbon. You will have to weigh the costs of these materials and decide which combination works best.

Water is almost free, but you need to do a lot of work to make use of it.
Purigen can be a bit expensive, but can be treated (it is cheap to treat) and reused for several uses.
Activated carbon cannot be reused, but is cheaper than Purigen just looking at the initial purchase price. When you compare the reuseability of Purigen, though, the AC might be more expensive.
You can sure do all three, in whatever ratio you want.
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