#1   Report Post  
Old 26-04-2010, 01:18 AM posted to rec.ponds.moderated
external usenet poster
 
First recorded activity by GardenBanter: Jul 2006
Posts: 184
Default UV lights for giardia?

Giardia [also known as beaver fever] is a nasty little protozoa that
I'd like to keep from taking up residence in my pond. It is
frequented by 3 pugs & though we can train them not to drink from the
pond- it is a handy source of refreshment for them.

Does anyone know what the strength of the Tetra 5w UV light is? I've
been using one with great success against algae.

I found a chart at
http://www.awwa.org/files/Advocacy/G..._Figure_17.pdf
that tells me how much UV is needed to kill Giardia-- but I don't
understand enough of the terms to understand the chart.

What is a "log credit"?

How do I determine millijoules/cm2 from the flow through my light?

This page says that I need to measure flow rate, UV intensity & UV
Transmittance.
http://www.awwa.org/files/Disinfection.pdf

I looked for a similar chart for killing algae, so I can see if it
takes more or less UV. If I'm reading this one correctly- it takes
much more UV to kill Algae [22000 microwatt-seconds per square
centimeter] than Giardia [10000 microwatt-seconds per square
centimeter]. Any water specialists agree/disagree?
http://www.islandnet.com/~tiger/Tige...w_uv_works.htm

Thanks,
Jim

Reply
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

Posting Rules

Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Questions about plant lights Faye Lifford-Earle Gardening 6 06-03-2012 07:38 AM
who here knows about giardia? Ann in Houston Ponds 17 21-10-2004 07:25 PM
who here knows about giardia? Ann in Houston Ponds 0 20-10-2004 03:50 AM
Lights On / Lights Off... is this OK? Bill Beam Freshwater Aquaria Plants 3 20-04-2003 07:22 AM
Lights On / Lights Off... is this OK? Bill Beam Freshwater Aquaria Plants 6 15-02-2003 02:54 PM


All times are GMT +1. The time now is 10:40 PM.

Powered by vBulletin® Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Copyright ©2004-2024 GardenBanter.co.uk.
The comments are property of their posters.
 

About Us

"It's about Gardening"

 

Copyright © 2017