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 .

ASIN	B07R7BP5Y5
Brand	AO Smith
Brand Name	AO Smith
Capacity	200 Gallons
Container Type	Cartridges
Customer Reviews	4.4 out of 5 stars 256 Reviews
Included Components	Wrench
Included components	Wrench
Installation Type	Freestanding
Manufacturer	AO Smith
Material	Plastic
Material Type	Plastic
Model Number	AO-WH-PRE
Other Special Features of the Product	Chlorine Reduction
Package information	Cartridges
Power Source	Corded Electric
Purification Method	Sedimentation
Special features	Chlorine Reduction

Whole House Water Sediment Pre-Filter

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