When do you change water filters?

[mikebusc]

I have a 4 stage water filter and I changed all filters about 6 to 8 months ago. I just checked with a TDS meter and I’m still only getting 1 to 2 PPM now. So should I keep them in until the TDS increases or is that not the only indicator to use?

 

[mjszos]

I change mine as soon as I get anything over 1TDS (I give some margin of error on the system), or every 6 months, whichever comes sooner. I typically purchase 2 sets every Black Friday to just keep around for the occasion.

 

[Gtinnel]

If we are talking about the carbon and sediment filters before the membrane I change mine whenever I see a pressure drop before the membrane or when the sediment filter looks bad. The membrane I go by the output tds after the membrane but before the resin (assuming the tds of your source water hasn’t changed). I replace the resin when my filtered water tds is anything above 0.

I wouldn’t let the sediment and carbon filters wait until your tds increases. They are cheap and are there to help protect the membrane.

 

[KStatefan]

Sediment filter change based on pressure
Carbon filters change based on gallons and the filters chlorine removal rating
Membrane rejection rate
DI color change and tds