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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AO SmithWhole House Water Sediment Pre-Filter

AO SmithWhole House Water Sediment Pre-Filter

Product ID: 256978413

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Details

Brand
AO Smith
Special features
Chlorine
Material
Plastic
Capacity
200 Gallons
Included components
Wrench

🏠Ideal for 1-4 person households

💧Whole house sediment reduction

🔧DIY filter replacement w/ pressure relief

Description

💧 Elevate your home water game—because clean water is the new luxury.

TRUSTED DURABILITY - Backed by AO Smith’s 1-year limited warranty for peace of mind.
COMPACT EFFICIENT - Standard 2.5" filter size perfectly tailored for small to mid-sized households.
COMPLETE STARTER KIT - Includes durable filter housing and wrench for seamless setup—cartridges sold separately.
SEDIMENT FREE LIVING - Protect every tap with whole house filtration that extends appliance life.
EFFORTLESS MAINTENANCE - Replace filters yourself—no plumber needed thanks to the built-in pressure relief button.

The AO Smith Whole House Water Sediment Pre-Filter is a compact, freestanding filtration system designed to reduce sediment from all household taps. It features a user-friendly DIY filter replacement with a built-in pressure relief button, making maintenance hassle-free. Ideal for homes with 1-4 people, it includes a filter housing and wrench, with filter cartridges sold separately, and comes with a 1-year limited warranty.

Specifications

Manufacturer	AO Smith
Part number	AO-WH-PRE
Item Weight	1.31 Kilograms
Product Dimensions	32.51 x 13.69 x 13.21 cm; 1.31 kg
Item model number	AO-WH-PRE
Material	Plastic
Power source type	Corded Electric
Installation Method	Freestanding
Item Package Quantity	1
Measurement System	English/Standard
Special Features	Chlorine Reduction
Included components	Wrench
Batteries Included?	No
Batteries Required?	No

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$186

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