---
product_id: 30345500
title: "Hot Tub Serum, A Weekly Maintenance Hot Tub Cleaner/Clarifier/Conditioner/Softener All-in-One 2 Liter (24 Weekly doses), Inflatable Hot Tub Chemicals for Complete Hot Tub Treatment"
brand: "hot tub serum"
price: "¥47253"
currency: JPY
in_stock: true
reviews_count: 8
category: "Hot Tub Serum"
url: https://www.desertcart.jp/products/30345500-hot-tub-serum-a-weekly-maintenance-hot-tub-cleaner-clarifier
store_origin: JP
region: Japan
---

# 1 oz per 100 gal weekly maintenance 2L liquid formula - 24 weekly doses Protects jets, pipes & heater Hot Tub Serum, A Weekly Maintenance Hot Tub Cleaner/Clarifier/Conditioner/Softener All-in-One 2 Liter (24 Weekly doses), Inflatable Hot Tub Chemicals for Complete Hot Tub Treatment

**Brand:** hot tub serum
**Price:** ¥47253
**Availability:** ✅ In Stock

## Summary

> 💜 Purple Gold for Your Hot Tub’s Glow-Up

## Quick Answers

- **What is this?** Hot Tub Serum, A Weekly Maintenance Hot Tub Cleaner/Clarifier/Conditioner/Softener All-in-One 2 Liter (24 Weekly doses), Inflatable Hot Tub Chemicals for Complete Hot Tub Treatment by hot tub serum
- **How much does it cost?** ¥47253 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/30345500-hot-tub-serum-a-weekly-maintenance-hot-tub-cleaner-clarifier)

## Best For

- hot tub serum enthusiasts

## Why This Product

- Trusted hot tub serum brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **All-in-One Powerhouse:** Cleaner, clarifier, conditioner, and softener combined for ultimate water wellness.
- • **Mold & Fungal Defense:** Clinically proven to reduce mold growth and fungal buildup under covers and in water.
- • **Effortless Weekly Care:** Just 1 oz per 100 gallons keeps your spa pristine and inviting.
- • **Trusted by Enthusiasts:** Top-rated with 4.7 stars and a loyal following of hot tub aficionados.
- • **Extend Your Hot Tub’s Life:** Prevents costly repairs by maintaining clean pipes, jets, and heater components.

## Overview

Hot Tub Serum is a premium 2-liter liquid formula designed for weekly maintenance of hot tubs. Delivering 24 precise doses, it cleans, clarifies, conditions, and softens water while protecting critical components like jets and heaters. Trusted by thousands with a 4.7-star rating, it effectively prevents mold and fungal growth, ensuring fresher, clearer water and extending the life of your spa investment.

## Description

desertcart.com : Hot Tub Serum, A Weekly Maintenance Hot Tub Cleaner/Clarifier/Conditioner/Softener All-in-One 2 Liter (24 Weekly doses), Inflatable Hot Tub Chemicals for Complete Hot Tub Treatment : Patio, Lawn & Garden

Review: Great for mold under the cover. - I've been using this product for 18 months. Made a huge difference with mold on my cover. Used to get black mold growing in several areas on the underside of the cover...this prevents almost all mold growth, and the water smells fresher. It's expensive, but I've continued to purchase repeatedly.
Review: Very Expensive, but Helps Keep the Hot Tub Hygienic - Hot tub operation and care can be tricky. There are a lot of gimmicks and useless products out there, but this is not one of them. I purchased this product after noticing the beginnings of a white fungal buildup in my tub. After using this product's companion, Total Cleanse, before a drain and refill, I began using Hot Tub Serum in my tub on a weekly basis. I have noticed a definite improvement in water quality and clarity since introduction of this chemical into my care and maintenance routine. I use a bromine-based sanitizer system and Hot Tub Serum plays nicely with it. The only drawback to this product is that it is hideously expensive. Essentially it costs about $6 per dose—making it by far the most expensive hammer in my chemical toolkit. I have researched this chemical and it appears to be safe by all accounts (this statement should not be construed as constituting medical or safety advice or endorsement, as it is my personal opinion only), and it is effective, so...it's up to the consumer to determine whether it's worth it. In my case, being able to eliminate a white fungal infestation, I'd say I did get what I paid for. One other note: I was pleased with the way the seller packaged and shipped the product. It arrived intact and undamaged. I had purchased this stuff earlier from another vendor, and was dismayed to find that the bottle had been damaged, and about half of the contents had leaked.The soggy, sweet-smelling cardboard carton sitting on my porch alerted me there was a problem; I'm not sure why the shipping company hadn't noticed. To be clear, the bottle I received from Unique Solutions, Inc., was intact and undamaged, which was a relief, given the high cost of the product. It would be great if eventually they offered a powdered version of this material that could be home-mixed to the proper strength by home chemists like me, but I realize we live in a world populated by dummies and anarchistic ne'er-do-wells, so the U.S. government probably won't be giving clearance for such a thing in my lifetime, and this stuff will remain hideously expensive as a liquid-only solution. Bottom line: this is one of those spa chemicals that truly delivers what it says it is supposed to deliver. It is easy to use (but you really should invest in a graduated cylinder if you don't already have one so you don't waste any of this "purple gold"). I plan to continue using it as a normal part of my care and maintenance routine as long as I continue to own a hot tub. I don't give many things five stars, but this is one product that deserves it.

## Features

- Your Hot Tub is part of your family. It deserves to be chemically pampered.
- Hot Tub Serum performs a Powerful Clean Performance.
- Serum maintenance is added at a weekly rate of one ounce per 100 gallons.
- This Hot Tub Serum will help protect all your hot tub components and increases filtration efficiency.
- Cut down on costly repairs and replacements with properly cleansed pipes jets and heater.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00SFZOABC |
| Best Sellers Rank | #9,619 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #29 in Swimming Pool Clarifiers & Enzymes |
| Brand | Hot Tub Serum |
| Customer Reviews | 4.7 4.7 out of 5 stars (551) |
| Is Discontinued By Manufacturer | No |
| Item Form | Liquid |
| Item Weight | 4.38 pounds |
| Item model number | Serum-03 |
| Manufacturer | Hot Tub Serum |
| Number of Items | 1 |
| Product Benefits | Maintains Clean Sanitized Water |
| Product Dimensions | 5 x 5 x 12 inches |
| UPC | 793573150295 |
| Unit Count | 67.6 Fluid Ounces |

## Product Details

- **Brand:** Hot Tub Serum
- **Item Form:** Liquid
- **Number of Items:** 1
- **Product Benefits:** Maintains Clean Sanitized Water
- **UPC:** 793573150295

## Images

![Hot Tub Serum, A Weekly Maintenance Hot Tub Cleaner/Clarifier/Conditioner/Softener All-in-One 2 Liter (24 Weekly doses), Inflatable Hot Tub Chemicals for Complete Hot Tub Treatment - Image 1](https://m.media-amazon.com/images/I/71stxhu1F+L.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great for mold under the cover.
*by A***R on October 21, 2025*

I've been using this product for 18 months. Made a huge difference with mold on my cover. Used to get black mold growing in several areas on the underside of the cover...this prevents almost all mold growth, and the water smells fresher. It's expensive, but I've continued to purchase repeatedly.

### ⭐⭐⭐⭐⭐ Very Expensive, but Helps Keep the Hot Tub Hygienic
*by G***D on January 26, 2022*

Hot tub operation and care can be tricky. There are a lot of gimmicks and useless products out there, but this is not one of them. I purchased this product after noticing the beginnings of a white fungal buildup in my tub. After using this product's companion, Total Cleanse, before a drain and refill, I began using Hot Tub Serum in my tub on a weekly basis. I have noticed a definite improvement in water quality and clarity since introduction of this chemical into my care and maintenance routine. I use a bromine-based sanitizer system and Hot Tub Serum plays nicely with it. The only drawback to this product is that it is hideously expensive. Essentially it costs about $6 per dose—making it by far the most expensive hammer in my chemical toolkit. I have researched this chemical and it appears to be safe by all accounts (this statement should not be construed as constituting medical or safety advice or endorsement, as it is my personal opinion only), and it is effective, so...it's up to the consumer to determine whether it's worth it. In my case, being able to eliminate a white fungal infestation, I'd say I did get what I paid for. One other note: I was pleased with the way the seller packaged and shipped the product. It arrived intact and undamaged. I had purchased this stuff earlier from another vendor, and was dismayed to find that the bottle had been damaged, and about half of the contents had leaked.The soggy, sweet-smelling cardboard carton sitting on my porch alerted me there was a problem; I'm not sure why the shipping company hadn't noticed. To be clear, the bottle I received from Unique Solutions, Inc., was intact and undamaged, which was a relief, given the high cost of the product. It would be great if eventually they offered a powdered version of this material that could be home-mixed to the proper strength by home chemists like me, but I realize we live in a world populated by dummies and anarchistic ne'er-do-wells, so the U.S. government probably won't be giving clearance for such a thing in my lifetime, and this stuff will remain hideously expensive as a liquid-only solution. Bottom line: this is one of those spa chemicals that truly delivers what it says it is supposed to deliver. It is easy to use (but you really should invest in a graduated cylinder if you don't already have one so you don't waste any of this "purple gold"). I plan to continue using it as a normal part of my care and maintenance routine as long as I continue to own a hot tub. I don't give many things five stars, but this is one product that deserves it.

### ⭐⭐⭐⭐⭐ Great, assuming you use it right
*by D***R on May 3, 2025*

Some interesting reviews about this. Such as "Their is no objective way to tell if this works". Note to reviewer, you are using it wrong! I use it every 10 days. Seems to be fine, trying to extend the use of this product due to it's expense. When you put it in, you let your tub run. You will see see some foaming. If you look carefully, you will see pink gunk in the bubbles. It looks like that big league chew gum from the 80's. Except that is very sticky. That is biofilm removed from your pipes! If by some reason there is nothing, then either are using it wrong, or you are the cleanest person on earth! Even if you bathe before using the tub (like I do) you will still get some. Scoop up the bubbles and dump it in a bucket. Let it run for 15 minutes to get all the biofilm out. Someone else reviewed that they use it just once when they refill their tub (every 3 months). Fresh water has no biofilm in fresh water. It doesn't prevent biofilm, it removes it. Great product if used right.

## Frequently Bought Together

- Hot Tub Serum, A Weekly Maintenance Hot Tub Cleaner/Clarifier/Conditioner/Softener All-in-One 2 Liter (24 Weekly doses), Inflatable Hot Tub Chemicals for Complete Hot Tub Treatment
- Hot Tub Serum Total Cleanse Gel, Hot Tub Cleaner, Purge & Flush, Works with Both Indoor & Outdoor Hot Tub & Spas, Clean Pipes & Jets Gunk Build Up, Purges 400 Gallon Water Tub 4 Times (2 oz)
- FROG @Ease Replacement SmartChlor Chlorine Cartridge - 3 Pack

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*Product available on Desertcart Japan*
*Store origin: JP*
*Last updated: 2026-02-26*