What spa sanitizer are you using currently?

What spa sanitizer are you using currently?
Chlorine
8  50%
Bromine
5  31.3%
Nature 2
2  12.5%
Ozonator
1  6.3%

Number of Voters  :  16
First Vote  :  Tuesday, 12 May 2009 22:13
Last Vote  :  Tuesday, 06 July 2010 16:17