does this fit a 4.5 x 10" filter? If so why is it not stated on the product as most of your customers would rather use a larger filter & replace less

It takes a 2.5x10 to be replaced every 6 months.

As I understand it the Post-Filter in the whole house diagram is a 5 micron filtration?

you can get different filter cartridges to fit this filter holder. cartridges sold separately

Does anyone know who sells the mounting brackets that fit this PRE system?

Check on Amazon or Home Depot but it's hard to find without the housing..

Can this be use as the pre-filter and the post filter? Also can this all be mounted outside?

Sure why not. Your question doesn’t say anything about pre and post what. I would venture to guess that you have some other kind of water treatment equipment between the two so maybe you would put different filter media in the post filter to further improve water quality. There are many kinds of filters you might use inside the canister .

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💦 Elevate Your Home's Water Quality!

COMPACT EFFICIENT - Space-saving design that fits seamlessly into your home without compromising performance.
PERFECT FOR FAMILIES - Ideal for households of 1-4 people, ensuring everyone enjoys pure water.
TRANSFORM YOUR WATER - Experience cleaner, fresher water from every tap in your home.
VERSATILE INSTALLATION - Can be used alone or paired with additional A.O. Smith systems for enhanced filtration.
DESIGNED FOR DURABILITY - Long-lasting filtration that protects your appliances and plumbing.

The AO Smith Single-Stage Whole House Water Filtration System is an NSF certified solution designed to reduce sediment and improve water quality for households of 1-4 people. With a compact design and versatile installation options, this system ensures that every tap in your home delivers cleaner, fresher water while protecting your appliances.

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Manufacturer	AO Smith
Item Weight	1.43 kg
Product Dimensions	32.51 x 13.69 x 13.21 cm; 1.43 Kilograms
Item model number	AO-WH-PRE
Colour	White
Measurement System	English/Standard
Batteries included?	No
Batteries Required?	No

AO SmithSingle-Stage Whole House Water Filtration System - Sediment Pre-Filter - NSF Certified - AO-WH-PRE

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