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Re: Materials for filter fittings - a chemistry question

First Brass is out --  especially if you salt your killies.  Nylon would
be better there  But I forsee a problem unless you intend to reinforce
the holes with something -- like for example 
1 inch x 2 or 3 inch wooden boards which would be in contact with
something solid like the floor.  Water is heavy stuff and will not only
push out the sides but can tear the material as well.  
Gary in St. Louis

On Thu, 07 Mar 2002 09:53:25 -0600 "William Vannerson"
<William_Vannerson at ama-assn_org> writes:
> First, a little background info... 
> 
> I'm getting ready to start building my wet/dry filter out of 
> Rubbermaid storage tubs. I bought a 55 gallon tub from Home Depot 
> for $15 for the filter sump and smaller 10 gallon tub from Menards 
> for $3, less a $3 rebate, for the media/drip container. My plan is 
> to suspend the 10-gallon tub in the top of the 55-gallon tub through 
> a cutout. My initial idea was to have the lid of the larger tub 
> suspend the smaller tub. But the sizes and shapes of the available 
> tubs does not end itself well to this idea as the lids are too 
> flimsy. I had hopes of placing the smaller tub near the edges of the 
> larger for added support, but the shapes and sizes of the available 
> containers don't lend itself to this placement. BTW, the 10-gallon 
> tub is appealing because it's relatively shallow. Deep containers 
> would require a lower water level in the larger sump container, 
> reducing the total capacity. I haven't calculated the volume yet, 
> but I'd guess I should have about 30 gallons of water in the sump 
> when complete. 
> 
> So... 
> My solution is to install two threaded rods across the width of the 
> larger tub. This will do two things. One, it will prevent the sides 
> from bowing out from the weight of the water. And, two, the two rods 
> can serve as a platform for the base of the media tub. 
> 
> But there are several materials to choose from for the rods. Steel 
> and stainless steel are out as they will rust. Stainless is 
> resistant, but will eventually rust. That leaves brass and nylon. 
> Brass is expensive for a 24" length but is strong. Nylon is harder 
> to find, but is almost half the cost (Small Parts has the on-line at 
> http://www.smallparts.com/). And I would think that it's not as 
> strong, but i believe that it would be more waterproof. 
> 
> So a question to the chemists out there, is either material, brass or 
> nylon, better suited for a filter system?
> 
> 
> 
> Bill Vannerson
> McHenry, IL
> http://vannerson.home.att.net/
> 
> 
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