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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🚽 Sparkle smarter, not harder — your toilet’s new best friend!

TOILET SAFE FORMULA - Bleach cleaning that refreshes without harming delicate toilet components or tank parts.
LONG LASTING FRESHNESS - Each cartridge delivers up to 3 months of continuous cleaning power—2-pack means 6 months total.
TRUSTED INDUSTRY LEADER - From Fluidmaster, the #1 toilet repair brand trusted worldwide since 1957.
QUICK SIMPLE INSTALLATION - Replace cartridges in under a minute—no tools, no mess, no hassle.
EFFORTLESS CLEAN EVERY FLUSH - Hands-free, scrub-free cleaning that keeps your toilet sparkling without lifting a finger.

The Fluidmaster 8302P8 Flush 'n Sparkle Replacement Cartridges provide a powerful, bleach-based automatic cleaning solution that activates with every flush. Designed for easy installation and lasting up to 3 months per cartridge, these refills ensure a hands-free, damage-free clean that keeps your toilet bowl crystal clear and deodorized for up to 6 months with the included 2-pack.

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RM128

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Malaysiastore

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Manufacturer	Fluidmaster
Part Number	8302P8
Item Weight	4.6 ounces
Product Dimensions	1 x 7 x 5 inches
Item model number	8302P8
Is Discontinued By Manufacturer	No
Size	2 Count (Pack of 1)
Color	_
Style	Bleach Cleaning Refills
Installation Method	1
Item Package Quantity	1
Special Features	Low Odor
Usage	Toilet
Included Components	Plumbing Fixtures; Toilets and Bidets;toilet-and-urinal-parts
Batteries Included?	No
Batteries Required?	No

Fluidmaster 8302P8 Flush 'n Sparkle Automatic Toilet Bowl Cleaning System Bleach Replacement Cartridge Refills, 2-Pack

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