Is it suitable to use only one Nature2 Stick for a swim spa? October 24, 2017 02:43 Follow Depending on your swim spa but recommendation is 1 x Nature2 Stick for up to 2000L spa volume. For more details on Nature2 Spa Stick, click here. Related articles Is it ok to have the Nature2 Stick laying horizontally? Why do I have white flakes in my spa? What happens to my Purezone Filter if I continue to use Spa Shock? What is BioGuard Armour and what are it's benefits? How do I use my Hot Springs ACE system? Comments 0 comments Article is closed for comments.