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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✨ Flush Away Your Worries! ✨

EASY INSTALLATION - Fits most toilets and installs in minutes.
LONG LASTING POWER - Enjoy up to 3 months of continuous freshness.
SAFE FOR YOUR TOILET - Cleans without damaging essential components.
PET FRIENDLY SOLUTION - Keep your home clean and safe for furry friends.
SCRUB FREE CONVENIENCE - Experience effortless cleaning with every flush.

The Fluidmaster 8300 Flush 'n Sparkle Automatic Toilet Bowl Cleaning System revolutionizes your bathroom routine by providing hands-free, scrub-free cleaning with a powerful bleach cartridge that lasts up to 3 months. Designed to be safe for your toilet's components and easy to install, this system ensures your toilet remains crystal clear and fresh without the hassle of traditional cleaning methods.

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Manufacturer	Fluidmaster
Part number	8300
Item Weight	181 g
Product Dimensions	5.08 x 12.7 x 17.78 cm; 181.44 g
Item model number	8300W-011
Size	1 Count (Pack of 1)
Color	_
Style	Bleach Cleaning Kit
Material	Crystal
Pattern	Cleaning
Installation Method	1
Item Package Quantity	1
Number of Handles	1
Special Features	safe for pets
Specific uses	Toilet
Included components	Fluidmaster 8300 Flush 'n Sparkle Automatic Toilet Bowl Cleaning System, Bleach
Batteries Included?	No
Batteries Required?	No

Fluidmaster8300 Flush 'n Sparkle Automatic Toilet Bowl Cleaning System with Bleach Cartridge

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