10-30-2007, 06:16 PM
Join Date: Apr 2005
Location: Sacramento, CA, USA
iTrader Positive Rating: 100%
| | Re: DIY UV Sterilizer
Originally Posted by SKSuser
Here's a link to a specifically germicidal bulb for reference.
In addition to Richard's suggestion of trouble about creating something where there is about 1/64" of glass between water and voltage, there is another aspect of concern:
Most PVC isn't UV rated.
You could end up with a very brittle container which could burst or crack during use (possibly breaking the bulb and electrocuting you while you attempt to stop the geyser of water), or else one which develops pinholes and might leak for days or weeks before you noticed that your UV sterilizer had become a sieve.
PS.. The same company who I linked to has a two pin bulb that appears to be the same one that Drs Foster sells as a replacement for the Coralife Turbotwist. However, its only about $2 cheaper on the other site. In my opinion, that's not worth the possible savings to find out if its indeed the correct bulb.
I think this is the best reason to leave the making of UV sterilizers to the professionals. Most plastics are sensitive to ultraviolet. Leave a piece of PVC pipe out in the sun, where just weak UV is hitting it, and it gets brittle in a couple of years. That same PVC exposed to intense germicidal UV could easily shatter in a matter of hours. Even ordinary glass won't withstand intense UV for very long. Quartz is used for that application, and even fingerprints on the quartz will cause cracking under intense UV.
Years ago I worked with a very high power UV "lightbulb", actually redesigning parts of it to make it last longer. I was astonished at how dangerous UV could be.