The first question about the so-called “Chemical Free Hot Tub” is “What does it Mean to be Green?” The second question is “Can it be done?”; a chemical-free hot tub, that is.
When you speak of eco-friendly spas and hot tubs, you may be talking about saving energy, saving water, or preventing pollution.
It’s that last part I want to discuss today – preventing pollution of local watershed, while enjoying a hot tub without unnecessary and unnatural chemicals.
What Does it Mean to be Green?
There are several categories of spa and hot tub chemicals that are considered “Green”, most made of natural ingredients and harmless to plants and animals.
Spa Enzymes: Enzymes are all-natural, microscopic organisms that eat oil and organics for breakfast, lunch and dinner. Reduces the amount of sanitizers needed, and helps filtration by removing oily gunk.
Citrus Cleaners: When cleaning a spa, to remove water line marks or polish up the shell, be careful not to use household cleaners that contain harsh chemicals, but instead use a citrus or vinegar solution.
Natural Clarifiers: Companies like SeaKlear have used crab shells for years as a natural clarifier for pools and spas. Natural polymers help your filter by coagulating smaller particles into easily filterable clumps.
There are also several “Alternative” purifiers, or systems that can supplement your bromine or chlorine residual, but aren’t complete sanitizers – they can’t usually do it all.
Ozone: Ozone generators create small amounts of the O³ molecule, which is very powerful, and kills anything that can exist in water. But, the distribution method can’t get the gas in contact with everything.
Minerals: Even the Ancients knew the power of copper and silver to purify water; and for a spa it’s super easy to add minerals with a Spa Mineral Stick, there are many brands available.
UV systems: The Ancients also knew of the power of sunlight to kill algae and mold. When water is bathed in UV light, most pathogens, bacteria and viruses will die – but not everything.
In addition to sanitizing the water daily and continuously, a hot tub needs periodic oxidation, or spa shock.
Is a Chemical Free Hot Tub Possible?
You can reduce reliance on chlorine and bromine by using supplemental sanitizers like minerals or ozone or UV systems. Use non-chlorine shock (MPS), if you want to be chlorine-free.
But, you will still need to test the water and add balancing chemicals, to lower pH, or raise alkalinity and calcium levels, for example.
Unless you drained the water every time you use the hot tub (not very Green), you will need to maintain balanced water (pH, alkalinity, calcium), as well as daily disinfection to sanitize, and regular shocking to oxidize the water.
For low-use hot tubs, an ozone or UV system AND a mineral stick will keep the water clear. Shock (oxidize) the water with MPS after each use (very important). Filter the spa water for at least 6 hours daily, and buy a new spa filter cartridge every 12 months (very important). Adding a natural clarifier or enzymes to the spa can also aid in reducing the amount of sanitizer and oxidizer needed.
Chemical Soup Hot Tubs?
With supplemental sanitizers and careful water balancing, you don’t need to add 9 kinds of spa chemicals to maintain clear and healthy water.
Instead, over-filter the water and combine natural spa chemicals and alternative purifiers for daily disinfection, and oxidize with MPS after each use, or weekly.
Happy Hot Tubbin’
Hot Tub Works