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 8300 Flush 'n Sparkle Automatic Toilet Bowl Cleaning System with Bleach Cartridge, 1 Count (Pack of 1) ( Packaging May Vary)

Fluidmaster 8300 Flush 'n Sparkle Automatic Toilet Bowl Cleaning System with Bleach Cartridge, 1 Count (Pack of 1) ( Packaging May Vary)

Product ID: 1533273

Details

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

🚽3-month continuous cleaning

🧴Bleach-powered disinfectant

⚙️Universal fit, easy install

S$26

Duties & taxes included

In stock

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Description

✨ Flush smarter, not harder! 🚽

TRUSTED BRAND LEGACY - From Fluidmaster, the #1 toilet repair brand worldwide since 1957, ensuring quality and reliability.
TOILET SAFE TECHNOLOGY - Cleans directly in the bowl, protecting delicate tank parts from damage caused by tablets or liquids.
UNIVERSAL COMPATIBILITY - Designed to fit most toilet models for a seamless, quick DIY installation in minutes.
LONG LASTING CLEAN POWER - One cartridge delivers up to 3 months of powerful bleach cleaning and deodorizing action.
EFFORTLESS SPARKLE EVERY FLUSH - Hands-free, scrub-free cleaning that keeps your toilet pristine without lifting a finger.

The Fluidmaster 8300 Flush 'n Sparkle is an automatic toilet bowl cleaning system that uses a bleach cartridge to clean and deodorize with every flush. It fits most toilets, installs easily, and protects internal components by delivering cleaning solution directly into the bowl. Each cartridge lasts up to 3 months, providing a hands-free, scrub-free cleaning experience backed by Fluidmaster’s trusted legacy.

Specifications

ASIN	B0002YOQXQ
Best Sellers Rank	#17,548 in Health & Household ( See Top 100 in Health & Household ) #99 in Household Toilet Cleaners
Brand	Fluidmaster
Brand Name	Fluidmaster
Cleaning Agent Formulation	Disinfectant
Contains Liquid Contents?	Yes
Customer Reviews	4.2 out of 5 stars 9,309 Reviews
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
Manufacturer	Fluidmaster
Material Feature	Toilet cleaner
Material Features	Toilet cleaner
Model Number	8300W-011
Number of Items	1
Part Number	8300
Product Benefits	Refill
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	1.0 Count
Warranty Description	Lifetime

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