Spa water care gets made more complicated than it needs to be. A hot tub holds a few hundred gallons at body temperature with people in it, which is a demanding environment chemically, but the actual routine comes down to a handful of products and about ten minutes a week.
What each product is for
- Sanitizer: chlorine or bromine, the thing that actually kills bacteria. This is not optional and it is not interchangeable with anything else on the shelf.
- pH increaser and decreaser: keeps water from turning corrosive or scale forming. Wrong pH also makes your sanitizer far less effective, which is why chemistry order matters.
- Alkalinity increaser: buffers pH so it stops swinging every time someone gets in.
- Calcium hardness increaser: soft water pulls minerals out of your equipment and can damage seals and heaters.
- Shock or oxidizer: burns off body oils, lotions, and organic waste that sanitizer alone does not clear. This is what fixes water that smells strong or looks dull.
- Filter cleaner: a degreaser for the cartridge. Rinsing with a hose is not the same thing.
For the underlying chemistry behind pH, alkalinity, and why they interact, see our guide to balanced spa water.
A routine that actually works
Weekly: test the water, adjust pH and alkalinity first, then check sanitizer level, then shock. Rinse the filter.
Monthly: deep clean the filter with a proper cleaner and let it dry fully, which is why a second cartridge to rotate is worth owning. Check calcium hardness.
Every three to four months: drain, clean the shell, and refill. More often if the tub gets heavy use. Fall is a natural time to do this so you go into the cold season with fresh water.
Bromine or chlorine?
Both work. Chlorine acts faster and is cheaper. Bromine is more stable at the higher temperatures a spa runs at and is gentler on skin and eyes for people who are sensitive, but it is slower to act and costs more.
The practical advice is to pick one and stay with it. Switching back and forth between systems without a full drain causes more problems than either one on its own.
The mistakes we see most
Adjusting sanitizer before pH. If the pH is out of range, the sanitizer cannot do its job no matter how much you add. Balance first, every time.
Skipping shock. Most cloudy water and most odor complaints are organic load, not a sanitizer shortage. People respond by adding more chlorine, which makes the smell worse.
Never truly cleaning the filter. A clogged cartridge starves the pump, strains the heater, and quietly undoes everything else you are doing.
Guessing at dosage. A 300 gallon spa and a 450 gallon spa need meaningfully different amounts, and test strips read differently in cold weather. Bring a sample in if the numbers look strange.
Bring us a water sample
Both showrooms carry the full lineup of spa chemicals and supplies, including test strips, filters, and cleaners, and we will test a sample and tell you exactly what to add and in what order. No charge, and it takes a few minutes.
If your water has gotten away from you entirely, our service team can handle a drain, clean, and restart instead. And if you are shopping for hot tubs and accessories or need pool and spa chemicals for the pool side of things too, both showrooms carry what you need.
