Are these effective at reducing contaminants like Lead and/or Arsenic?

No. I use a RO (reverse osmosis) system for removing arsenic.

How does this differ from AO-WH-PRE-RCP2? Is it just filter life, or does one filter better than the other?

This is what our installer recommended. We have not used any other filter as these work very well. We change them about every 5 months.

how frequntly should they be changed?

The package indicates the filter lasts up to six months. I usually change it within the fifth month.

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

VALUE PACKED 2 PACK - Double up with two replacement cartridges, so you’re always ready to maintain your whole house system.
EFFORTLESS MAINTENANCE - Replace your filter every 6 months with zero plumber hassle—designed for easy DIY swaps.
CERTIFIED GENUINE QUALITY - Only AO Smith certified filters guarantee peak contaminant removal and system longevity.
CRYSTAL CLEAR WATER EVERY TAP - 5 micron filtration removes sediment invisible to the naked eye for pristine water throughout your home.
OPTIMIZED FOR MODERN HOUSEHOLDS - Standard 2.5" size perfectly supports homes with 1-4 people, ensuring consistent water purity.

AO Smith’s 2.5" x 10" 5 micron carbon block sediment filter replacement cartridge is engineered for whole house filtration systems, delivering ultra-fine sediment removal to protect appliances and improve water quality. Certified genuine AO Smith filters ensure optimal performance and easy, tool-free replacement every 6 months, ideal for households of 1-4 people. This 2-pack offers convenient, long-lasting sediment filtration for every tap in your home.

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