Hot Tub Serum Turbo Mineral Stick | Spa Purifier
Excluded Brands
The following brands are not eligible for LTI discount codes (including WELCOME). They go on sale only during manufacturer-authorized promotions:
- Gozney — pizza ovens and accessories
- OHCO — massage chairs
- Positive Posture — massage chairs and recliners
- Nomadix — outdoor lifestyle products (towels, blankets, accessories)
Excluded Products
The following individual products are also not eligible for discount codes:
- Any product that already has a price markdown — items on sale or clearance can't stack additional discounts on top
- FreshWater Salt System Replacement Cartridge (single)
- FreshWater Salt System Replacement Cartridge (3 Pack)
- Route Protection Insurance — third-party shipping protection, not eligible for our discounts
- Bullfrog A / R / X Series 10-00282 Filter Cartridges
- Bullfrog STIL Series 10-00281 Filter Cartridges
- FROG® @ease Sanitizer System for Bullfrog Spas
- FROG® @ease Replacement Cartridge for Bullfrog Spas (3 Pack)
- Bullfrog Simplicity™ Flat Filters for M Series (4 Pack)
- Filter Core Cage & Cap Assembly for Bullfrog Spas
- Fireplaces (gas, wood-burning, and fireplace inserts)
- Electric Fireplaces
- Gas Vent Pipe
- Pellet Vent Pipe
- Fireplace Fronts
This list can change. Manufacturers occasionally add or remove products from their MAP-protected lists. We update this page when they do, but the most accurate way to confirm whether a discount applies to a specific item is to add the item to your cart and try the code at checkout. If the code doesn't work, the item is excluded. If it does work, it's eligible.
Returns On Hazardous Materials
Some of the products we sell — primarily spa and pool chemicals — are classified as hazardous materials by the U.S. Department of Transportation (DOT). These items can't be returned to us by mail, even though we'd like to make returns easy on every product. This page explains why the rule exists, what's covered, and what your options are if you have unopened chemicals you no longer need.
The short version: We can't accept hazmat returns by mail (federal regulations prohibit it), but we can accept them in person at our Idaho Falls, Boise, or Twin Falls showrooms. If a product arrived damaged or defective, that's handled differently — call us right away and we'll work with the manufacturer on a replacement or refund.
The Hot Tub Serum Turbo Triple Action Mineral Stick is a natural mineral purifier that makes your spa water cleaner, softer, and easier to care for — while letting you use far less chlorine or bromine. It drops right into your filter housing and goes to work with the power of silver and copper, the minerals that have been used to fight bacteria and algae for centuries.
The "triple action" name captures what it does: it reduces bacteria naturally, softens and conditions the water so it's gentler on skin and eyes, and helps protect your equipment from the scale and corrosion that shorten a spa's life. Because the minerals do part of the sanitizing work, you can cut your traditional sanitizer down to a fraction of the usual level — less chemical smell, softer water, and a more natural soak.
Best of all, it's effortless: one stick lasts up to four months. There's no measuring, no daily dosing — just drop it in and let it work.
Hot Tub Serum®
Hot Tub Serum® Brand FAQs
What is Hot Tub Serum, and how is it different from other spa chemicals?
Hot Tub Serum is an EPA-registered water care line built around one idea most spa chemicals ignore: cleaning and protecting the inside of your spa's plumbing. Its products prevent and remove biofilm— the bacterial sludge that builds up in pipes and jets and keeps re-contaminating your water. Made by Serum Watercare, the line is registered with the EPA in all 50 states.
Does Hot Tub Serum replace my sanitizer?
No. Hot Tub Serum works along side your sanitizer, not instead of it. You still need to maintain an EPA-approved sanitizer (chlorine, bromine, salt, or a mineral system) at proper levels. Serum keeps your plumbing clean and makes your sanitizer more effective — so most owners end up using less of their other chemicals — but a sanitizer is always required.
What is biofilm, and why does it matter in a hot tub?
Biofilm is a slimy layer of bacteria that forms inside spa plumbing where you can't see or reach it. It protects the bacteria within it from your sanitizer, which is why an untreated spa can stay cloudy, smelly, or sanitizer-hungry no matter how carefully you dose. Because it hides in the pipes, it keeps coming back until it's addressed at the source — which is exactly what Hot Tub Serum targets.
How does the Hot Tub Serum Total Clean System work?
It's a simple two-step regimen. First,Total Cleanse is added before a drain-and-refill to purge existing biofilm and gunk out of the plumbing. Then, once the spa is refilled,Total Maintenance is added weekly to keep that biofilm from ever coming back. Purge to clean, maintain to keep it clean.
Is Hot Tub Serum compatible with my sanitizer system?
Yes. Hot Tub Serum is compatible with all sanitizing systems — chlorine, bromine, salt water generators, biguanide, and mineral systems such as The Frog®, @ease®, and Nature2®. It's also unaffected by pH swings, cyanuric acid, and common oxidizers, so it keeps working even when your water chemistry drifts.
Is there a warranty benefit to using Hot Tub Serum?
Serum Watercare offers a Lifetime Jet Warranty for owners who use Total Maintenance weekly through an authorized dealer's auto-ship program. Because jet failure is often caused by scale and water-chemistry buildup that Serum helps prevent, the program covers replacement of removable jet inserts that fail due to water chemistry. Ask us about enrolling.
About Hot Tub Serum®
Hot Tub Serum is a water care brand from Serum Watercare, built on a simple insight the rest of the industry overlooked: the biggest threat to clean hot tub water isn't in the water you can see — it's the biofilm hidden inside your plumbing. Where conventional chemicals only treat the water in the shell, Serum's EPA-registered formulas clean and protect the pipes, jets, and internal surfaces where bacterial sludge takes hold.
The result is the Total Clean System: a purge product (Total Cleanse) that scrubs existing biofilm out of the plumbing before a drain-and-refill, and a weekly maintenance product (Total Maintenance) that keeps it from ever returning. Registered with the EPA in all 50 states and backed by a first-of-its-kind Lifetime Jet Warranty for regular users, Hot Tub Serum is designed to make spa care simpler while protecting the equipment you've invested in — for water that stays clear, soft, and fresh with less work.


