BTW: Thank you Leopardess, it was your post that inspired me to do my little project. Good stuff! I kinda over-engineered mine a bit, but I tend to do that (alot).
beviking said:
So you saved $2, ended up with 5'less and still could have used more/different material? What about the TIME you invested? For $2 more you could have had all the shutoffs, hose that wouldn't collapse, 5' more hose, and some more time to appreciate your tank!

BTW - I did the same but have a 50'-er.
Mine is about 25 feet. 20ft I bought, 5 or so feet from the gravel vac I included in the project.
Aye, if I add in the cost of the valve, (simple little plastic ball valve for $1.50) I probably saved about $0.50

Knock off the gravel vac, (for those that already have one or don't want to use one) and you are at around $24 (but 5 feet shorter). As for longer lengths, thats where some real cost savings come in. The lengths of hose (20ft each) were $4.50, so a 40 footer with the same materials costs about $6 more. (around $35 total.) The reinforced hose was about 5.50 for a 20 foot length, so the cost is $1 more to use the reinforced hose. The length of my gravel vac hose was about 5-6 feet, so mine is around the same length as a store-bought python. The valve and the reinforced hose go in the "Lessons Learned" department.

I might do some research, and see if more cost savings can be achieved.
Time invested: I went to several home improvement stores looking for the venturi device, none of them even had a clue what I was talking about. Finally found one at petsmart right next to the pythons that they sell. Everything else (except the gravel vac, I got that when I bought my tank) was all in the same spot at Home Depot. For me, thats about 1.5 hours total, (including driving time!) minus the time I spent hunting the venturi. Home depot is a 20min drive each way. 30 minutes after I got home I was changing the water in my tank. That includes time for lunch. (YMMV) For me, that isn't much more time than buying one pre-made. (and much less fun!)
So: for the improved design, (with shut off valve and reinforced hose) I'd say about $30 dollars for a 25 footer, if you count the cost of the gravel vac. About the same as a store bought, with more time involved. Not worth it unless you get enjoyment from DIY'ing. (I do!) A 45 footer would be around $36, a moderate to significant savings. an 85 footer would be around $46-50.
All that being said, If you don't mind going to the sink to disconnect the hose to drain, you could do without the venturi, then don't get all fancy-schmancy like I did. Just add more hose and an adaptor to your existing gravel vac, or make one just like leapordess describes. Mad savings.
I'm the type of person that if I can build something for less than or nearly the same as something that I can buy in the store, and it is of similar or better quality, I'll build it every time. To give you an idea of how my brain works: I've looked at the power compact lighting kits that are on
Aquarium Hobbyist Supply and the first thing that comes to mind is this: "Oooh! I know where to get those components, I'll make one myself!" (yeah, I'm a little crazy.) I'm a mechanic by trade and tinkering is fun for me, so I have (some) skills and I'm whacko. I built my last 3 computers, too. The first is retired, (canabalized would be a better word) and the other two me and my roomate currently use.