If you have dirt or Mopani wood, why fight tannins? I tried Purigen to clear my tannins before I knew any better, but I was back to stained water soon enough. I read up and found that tannin-stained water was not a problem.
Cosmetic reasons, also the dirt does not release tannins if you are not using garden soil. I use Fluval stratum which is an alternative to ADA Amazonia, both do not release tannins. Who said I use Mopani wood anyway?
Originally Posted by HairyNoseWombat
I agree with that and just want to add that if you also use Ceramic type media the water should run through a fine sponge or floss before it hits the media or it too can get dirty and clog.
The correct order in my opinion is Sponge or floss, then Media and finally Purigen and you will have crystal clear water.
What I would do is ditch that cartridge in the HOB and use a prefilter sponge on the intake half fill the HOB with good media, Without all that junk in the HOB you will have lots of room
About 2 dollars each
Now for the good bit.
Go out and buy a fine mesh bag similar to this.
They are about 2 dollars for 5.
Then cut open that bag of Purigen and pour some of the contents into the new bag tie off the top and pop it onto the media and you are set.
Again, this increases maintenance. Tiny surface area prefilters never last long enough then you have to stick your hand in the tank and pull the thing off...I would rather pull out an easily accessible floss pad, discard and be done. I also do not like the look of prefilters in such a small tank. I do not really see it necessary to run any filter media for biological filtration in such a small tank, it only has a Betta, a horned Nerite, and a few shrimp. The Purigen will double as my biological.
The bags in your photo reminded me that I had this green bag laying around that crystal gem stones came in, perfect size! The only thing is I am not sure how the green bag will hold up when it comes time to bleach the Purigen...or if the green dye will end up in my water column so I am not sure I want to use it yet. The Purigen did get discolored quite quickly (the entire 100 gallon bag) in about 2 weeks however this is a new tank so that may be why. Typically in the past it would remain lighter than this even after a few months had passed.
Originally Posted by Blue Ridge Reef
I would think the bag around the Purigen would be more the mechanical filter, but obviously some gets through. That's the thing about Purigen though, you can recharge it. When in a pinch for for a cheap filter bag, I've had decent luck with no-run pantyhose. It's not terribly reusable but you can get 3-4 rinses out of them and just cut the length of the leg, pour in media and tie knots.
Ehh, I don't agree with this. Nobody wants to rinse out mechanical filtration equivalents (aka Purigen bags) they want to throw mechanical filtration away and be done with it. The aftermarket bag is to reduce the size of the Purigen bag, not to add a layer to it. If you enjoy rinsing mechanical filtration be my guest, but I don't have time for that nonsense lol. Sure you eventually have to recharge Purigen due to tannins, but not due to particles.
One of main reasons I don’t like filters that use pre-made cartridges.
Will take a good old Aquaclear with basic square basket that I can just put a bag in, set a small stone on it to hold it down and be done with it any day.
I replaced the premade filter that had floss stamped onto a plastic frame with carbon sealed inside with a plastic frame and floss bag. I would put the Purigen bag inside the floss bag but I would rather the water pass through both layers/sides of the floss bag before going through my Purigen.
I bought a 12-pack pretty cheap and removed the carbon. I then cut the center bridge support/carbon divider out to make room for more floss (hopefully it slows the flow down a bit). The floss pad was actually a universal fit air filter from Walmart. The entire assembly then slides into the floss bag providing excellent mechanical filtration. The carbon is useless it generally only lasts a week where the floss is good for about a month.