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

Product ID: 1533273

Details

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

⏳Up to 3 months cartridge life

🚽Cleans with every flush

🧴Bleach-based powerful cleaning

€ 28.92

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Description

✨ Flush smarter, not harder! 🚽

TANK SAFE TECHNOLOGY - Cleans directly in the bowl without damaging internal toilet components—protect your investment.
ODOR FREE CRYSTAL CLEAR - Powerful bleach formula deodorizes and prevents algae and mold for a fresh, spotless bowl every time.
UNIVERSAL FIT QUICK SETUP - Fits most toilets and installs in minutes with simple DIY instructions—upgrade your bathroom routine instantly.
LONG LASTING CARTRIDGE POWER - Up to 3 months of continuous, effective cleaning per refill—less hassle, more hygiene.
EFFORTLESS SPARKLE EVERY FLUSH - Hands-free automatic cleaning that keeps your toilet pristine without scrubbing.

The Fluidmaster Flush 'n Sparkle Automatic Toilet Bowl Cleaning System delivers hands-free, scrub-free cleaning with every flush using a bleach-based cartridge that lasts up to 3 months. Its innovative design injects cleaning solution directly into the bowl refill stream, protecting toilet tank components from damage. Easy to install and compatible with most toilets, it keeps your bowl crystal clear, deodorized, and free from algae and mold—perfect for busy professionals who demand hygiene without the hassle.

Specifications

ASIN	B0002YOQXQ
Best Sellers Rank	#4,427 in Health & Household ( See Top 100 in Health & Household ) #29 in Household Toilet Cleaners
Brand	Fluidmaster
Brand Name	Fluidmaster
Cleaning Agent Formulation	Disinfectant
Customer Reviews	4.3 out of 5 stars 13,190 Reviews
Global Trade Identification Number	00039961083005
Included Components	Fluidmaster 8300 Flush 'n Sparkle Automatic Toilet Bowl Cleaning System, Bleach
Item Form	Tablet
Item Highlight	Cleans with every flush, Includes bleach cartridge, Up to 3 months of hands-free cleaning, Installs in minutes
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	System
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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€ 28.92

Duties & taxes included

In stock

Sold byAmazon ItalyDelivered 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 Italy.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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