Hot Tub Serum Dichlor | Spa Chlorine Granules
Hot Tub Serum Dichlor is a fast-dissolving, stabilized chlorine sanitizer for hot tubs and spas. Its granular sodium dichlor formula dissolves quickly and completely, providing a steady source of available chlorine that controls algae, kills bacteria, and destroys organic contaminants — the core sanitizing your spa needs to stay safe and clear.
Sanitizer is the single most important part of spa water care. A hot tub is warm, agitated, and used at close quarters — ideal conditions for bacteria. Chlorine keeps that water safe to soak in, neutralizing bacteria continuously between uses. Let it drop and the water can turn cloudy, develop an odor, and stop being sanitary; keep it in range and the water stays clear and worry-free.
Because these granules are stabilized against UV, the chlorine resists burning off in sunlight — slowing the decay rate and extending the life of your treated water in an outdoor spa. And they're designed to work seamlessly with Hot Tub Serum Total Maintenance, so your chlorine and your weekly biofilm care work as one regimen.
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.
