Top Navigation  
 
U.S. Flag waving
Office Hours Momday - Friday  8 am - 5 pm Pacific 1-800-835-2418
 
Facebook   YouTube   Twitter
 
Features
 Home Page
 Current Issue
 Article Index
 Author Index
 Previous Issues

Bookstore
 Subscriptions
 Kindle Subscriptions
 Kindle Publications
 Anthologies
 Books
 Back Issues
 Discount Books
 All Specials
 Classified Ad

Advertise
 Web Site Ads
 Magazine Ads

More
 BHM Forum
 Contact Us/
 Change of Address

Forum / Chat
 Forum/Chat Info
 Lost Password
 Write For BHM


Link to BHM

Get Powered Up! Certified Energy Manager Jeff Yago answers your alternative energy questions

Wondering about a great new energy-saving device
you found on the Internet? Then CLICK HERE!

Sorry. Jeff no longer answers questions online.
This will remain as a searchable
resource for all BHM website visitors.



Archive for the ‘Toilets’ Category

 

Water pressure for toilets

Friday, March 13th, 2009

Jeff,

I am a student, and I am planning a solar water pumping system to supply non-potable water to a public bathroom on a Island. I am having a hard time finding a toilet to use in this system.

We are planning on having a large above ground storage tank to hold all the water. My biggest question is what type of toilet can be run on low pressure as the holding tank may only be 5-10 feet above the bathroom. We are trying not to have to install a separate pump to pressurize the system.

We are assuming a gravity feed toilet would be just fine, as most toilets are gravity feed. Most of the literature that I have read on gravity feed toilets suggest a water pressure of about 20PSI, which would require considerably more head.

Thanks

Jeff Hamman
Jeff,

It sounds like you need more consideration of other options. I can’t design a system on a free web site as we do not have the time and would never know all of the design parameters for the hundreds of request we get. However, I will give you some things to help you fine tune your design process.

1. You say you will have a large water storage tank, which in turn will provide water to flush toilets. It’s a law of nature that for every foot of height you raise any tank, the pressure at the bottom outlet will increase .43 psi per foot of height. You do not need to raise a large heavy tank, you could raise a smaller tank up on a nearby hill and fill it from the larger tank.

2. Consider waterless urinals and cut the total water usage by 50%. http://www.airdelights.com/waterfree_urinal.html

3. Use a second pump and pressure tank feed from the large storage tank. You can get any pressure and flow you want by selecting the right pump, which can be powered from a solar-charged battery. These require clear water entering so you will need some kind of filter between the tank and the pump.

Good Luck,

Jeff Yago

 
 


 
 

 
 
 
 
 
Copyright © 1998 - Present by Backwoods Home Magazine. All Rights Reserved.