Purigen is just too darn big - The Planted Tank Forum
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post #1 of 21 (permalink) Old 07-01-2013, 07:34 PM Thread Starter
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Purigen is just too darn big

So I have an azoo palm filter that I've been using with a 100ml bag of purigen, but it's just a little too big for the filter. The bag barely fits in the media chamber and I feel like it stops water too much to make the purigen as effective as it could be. I wanted to make it smaller, but that would require opening the bag. My question is how would I reseal it so little purigen grains don't invade my tank? I thought maybe an all plastic twist tie, but I don't know if that would tie it tight enough. Any thoughts? Should I just leave it as is?
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post #2 of 21 (permalink) Old 07-01-2013, 10:00 PM
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needle and nylon thread is what I would use but I haven't heard of anyone else doing that so maybe there's a reason? I know that people have used nylon thread in tanks for other reasons.
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post #3 of 21 (permalink) Old 07-01-2013, 10:22 PM
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A couple of good tight knots with doubled kitchen string will do the job. I've done that for years using different sized fine mesh bags bought @ PetSmart.
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post #4 of 21 (permalink) Old 07-01-2013, 10:54 PM Thread Starter
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The string won't deteriorate in the water?

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A couple of good tight knots with doubled kitchen string will do the job. I've done that for years using different sized fine mesh bags bought @ PetSmart.
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post #5 of 21 (permalink) Old 07-01-2013, 11:02 PM
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How about fishing line? You can get a 400 or so yard spool of 4lb test at walmart for around $3-$4.

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post #6 of 21 (permalink) Old 07-01-2013, 11:06 PM Thread Starter
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How about fishing line? You can get a 400 or so yard spool of 4lb test at walmart for around $3-$4.
I suppose so. Will that keep it sealed though? I'm just paranoid of a purigen explosion.
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post #7 of 21 (permalink) Old 07-01-2013, 11:11 PM
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I've heard of people cutting the foot off some panty hose and putting it in there. Then they just knotted the open end.

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post #8 of 21 (permalink) Old 07-01-2013, 11:24 PM
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I suppose so. Will that keep it sealed though? I'm just paranoid of a purigen explosion.
just sew it shut with fishing line a knot can always fail

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post #9 of 21 (permalink) Old 07-01-2013, 11:43 PM
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the next time you replace your Purigen get one of their nylon bags and a jar of Purigen; that way you can put in an exact amount and have room to fit it into the filter. The bag can be re-used forever.
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post #10 of 21 (permalink) Old 07-02-2013, 01:05 AM
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I had a seam break on my purigen bag and since it is plastic, I used a lighter to melt it and just squeezed it closed. I don't know if yours is plastic, but you can just cut it to size and heat up the seam and pinch it closed.
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post #11 of 21 (permalink) Old 07-02-2013, 01:22 AM Thread Starter
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I had a seam break on my purigen bag and since it is plastic, I used a lighter to melt it and just squeezed it closed. I don't know if yours is plastic, but you can just cut it to size and heat up the seam and pinch it closed.
Mine is the original bag it came in, I assume its plastic. I might do that. I guess the question is do i need to do it though? I was jus curious because I've heard purigen works best when it's swimming about and the purigen is packed so tight together to fit in the filter, that it doesn't move at all. It also leaves me almost no room for any other media. The bulk of the bio filtration currently coming from a fluval edge prefilter sponge on the intake.
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post #12 of 21 (permalink) Old 07-02-2013, 01:23 AM Thread Starter
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Anyone can vouch for panty hose?
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post #13 of 21 (permalink) Old 07-02-2013, 01:38 AM
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This is what I would try. Cut the bag and then using a piece of aluminium foil on the top and bottom, I would use a clothes iron to try and seal it back together.
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post #14 of 21 (permalink) Old 07-02-2013, 01:57 AM
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The string won't deteriorate in the water?
Good-sized kitchen string (you know, the type you use to roll around & tighten up steaks for the bbq) tied tightly & knotted well, will last far longer than nylon stocking, for example, before deteriorating & falling apart.
Matter of fact, I've never had any fall apart, and that's going through at least a dozen to 15 bleach re-charges.
And BTW, Purigen works best when loosely packed, not more than a 1/2" thick layer in a bag laying flat, so that the water flow within the filter can pass through all the particles easily and readily - thus getting maximum exposure and efficacy.
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post #15 of 21 (permalink) Old 07-02-2013, 02:47 AM Thread Starter
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What about a plastic twist tie if you can keep the exposed metal ends out of the water?
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