Not rain on anybody's parade. But the cost list above is incomplete. It doesnt include the cost of gas to run around to all the stores to get the stuff, nor the wear and tear cost on the car, It also doesn't include the value of the time involved. You can earn 8-10 bucks an hour flipping burgers. So if you spent 5 hours on the project- including getting everything, then there is another 40-50 bucks of cost.
My guess is the true cost of the diy filter is really over $100, Checkout what equipment you can buy online for that- even paying for shipping.
There are only two reasons i can see for doing anything DIY. The first is because exactly what you need isnt available premade. The second is because you enjoy doing it. It is very rare for anything DIY actually to cost less than premade.
You know, this really isn't nearly as expensive as the OP makes it out to be. You can similarly use a powerhead, a soda bottle and some media, and it shouldn't total more than $20 and a few minutes. I don't think the "value of time" should be counted in since it can be done in our free time. No one's going to take 5 hours off from work to do this. Although I guess the weakness in this is that it's virtually the same as every internal filter I've ever seen.
I made a DIY very inexpensively. I took a travel coffee mug that had the lid that separates into two parts. Took the top part off. Then I took an air hose and shoved it down the middle of some pot scrubbers from the dollar store, attached a one inch air stone. Dropped some rocks in the bottom to give it weight. I put it in the tank, let the cup fill up with water. Attached an aerator. Walla an instant filter. Everything is forced down to the bottom of the cup and has to come up through the pot scrubbers to get out the holes in the part of the lid that is on. I wouldn't use it on a heavy bioload but it works. Water is crystal. Am 0, Ni 0, Na 25.
there is one BIG differrence though with the other internal filters and mine- you can customize the one i made anyway you wish and there is lots of space to be used too!!!
sorry about the double post, i wanted to reply to both posters but dont know how to do that in one post, if you follow me!!!
, it was done on my free time at not time off from work (dunno where that idea came from), so there was no work time lost in wages...