Independent reference
OwnerSpec
Independent, numbers-first answers about the equipment in your home: what the spec actually means, what size you need, and which part fits.
Most equipment questions have one correct answer and it is a number. How many grains of capacity for four people on 22 gpg water. What micron rating a sediment filter needs on a well. Which cartridge fits a housing you already own.
Those answers are usually published by whoever wants to sell you the hardware. OwnerSpec publishes them independently: the formula, the inputs, the working, and the source it came from, so you can check it rather than trust it.
Legal
Privacy, cookies, terms of use, affiliate disclosure and disclaimers for OwnerSpec.