What is the difference betwee the Fluid Master Flush and Sparkle 8100 and 8300P8 models?

8300 is bleach only. The description for 8100 blue cartridge says that in addition to the bleach, it is a Surfactant-based cleaning agent which reduces spread of viruses and bacteria. The 8200 green cartridge is for septic tanks where bleach shouldn't be used.

Is the cartridge supposed to sit above or below the water line of the tank, or doees it matter?

Thank you for your question concerning 8300P8 Flush “n” Sparkle Bleach Kit. The housing unit that the cartridge is inserted into is a sealed container and can get wet. The housing unit in most cases is located above the water line however it can be partially submerged. For additional questions on any Fluidmaster product please contact us at your earliest convenience. Fluidmaster’s Technical Service Department is available Monday through Friday from 5:30 AM through 5:00 PM Pacific Standard Time. Contact options include: Chat www.fluidmaster.com/support E-Mail techsupport@fluidmaster.com and Toll Free 800-631-2011.

Is this product safe for septic systems? I mean, will it kill all the good bacteria in the septic tank?

It's fine. We use bleach in way higher quantity in the washing machine with no issues. Your septic tank is a few hundred gallons of poo. That little amount will do nothing.

Is the cartride supposed to sit above or below the water line of the tank, or does it even matter?

It does not matter. The cartridge gets water directly from the toilet float valve. There are two tubes to the cartridge system, input and output, water is pushed into the cartridge system circles around the cleaning tablet and out through the output line into the flapper and to the toilet bowl.

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Fluidmaster Flush 'n Sparkle Automatic Toilet Bowl Cleaning System

Fluidmaster Flush 'n Sparkle Automatic Toilet Bowl Cleaning System

Product ID: 1533273

Details

Brand
Fluidmaster
Item Form
Tablet
Material Feature
Toilet cleaner
Scent
Unscented
Specific Uses For Product
Toilet

⚡automatic flush-activated cleaning

🚽3-month cartridge life

🛠️universal fit & easy install

HK$218

Duties & taxes included

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Description

🚽 Flush smarter, not harder—sparkle with every flush!

TANK SAFE TECHNOLOGY - Delivers bleach cleanser directly into the bowl without harming flappers or tank components—protect your toilet’s longevity.
TRUSTED BRAND LEGACY - From Fluidmaster, the #1 toilet repair brand worldwide since 1957—quality and reliability you can count on.
LONG LASTING CLEAN POWER - One cartridge keeps your toilet crystal clear for up to 3 months, saving time and frequent replacements.
UNIVERSAL FIT DIY FRIENDLY - Fits most toilet models and installs in minutes with included step-by-step instructions—upgrade your bathroom routine hassle-free.
EFFORTLESS SPARKLE EVERY FLUSH - Hands-free, scrub-free cleaning activated automatically with every flush—no more manual scrubbing or harsh tablets.

The Fluidmaster Flush 'n Sparkle Automatic Toilet Bowl Cleaning System is a universal, easy-to-install solution that automatically cleans and deodorizes your toilet bowl with every flush. Featuring a powerful bleach cartridge lasting up to 3 months, it protects toilet components by delivering cleaner directly into the bowl, eliminating the need for damaging tablets or liquids. Trusted globally, this system offers a hands-free, hassle-free way to maintain a spotless toilet effortlessly.

Specifications

ASIN	B0002YOQXQ
ASIN	B0002YOQXQ
Best Sellers Rank	#11,843 in Health & Household ( See Top 100 in Health & Household ) #76 in Household Toilet Cleaners
Brand Name	Fluidmaster
Cleaning Agent Formulation	Disinfectant
Customer Reviews	4.2 4.2 out of 5 stars (9,331)
Date First Available	January 1, 2008
Global Trade Identification Number	00039961083005
Included Components	Fluidmaster 8300 Flush 'n Sparkle Automatic Toilet Bowl Cleaning System, Bleach
Item Form	Tablet
Item Type Name	Fluidmaster 8300 Flush 'n Sparkle Automatic Toilet Bowl Cleaning System, Bleach
Item Volume	0.04 cubic inches
Item Weight	6.4 ounces
Item model number	8300W-011
Manufacturer	Fluidmaster
Manufacturer	Fluidmaster
Material Features	Toilet cleaner
Model Number	8300W-011
Number of Items	1
Part Number	8300
Product Benefits	Refill
Product Dimensions	2 x 5 x 7 inches; 6.4 ounces
Scent	Unscented
Size	1 Count (Pack of 1)
Special Features	safe for pets
Specific Uses For Product	Toilet
Surface Recommendation	Toilet
UPC	039961083005
Unit Count	1 Count
Warranty Description	Lifetime

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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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HK$218

Duties & taxes included

In stock

Sold byAmazon Hong KongDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Hong Kong.

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TrustScore 4.5 | 7,300+ reviews

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