Product review (3 stars): I should have spent more and purchased a GE replacement
Be prepared for annoying reminders from seller to rate these filters.
Tap water here in 92592 is about 489 using a TDS tester.
Using this filter brought it down to 379.
I have no clue what GE replacement would achieve however I am certain it would not bring TDS to 125 I'm getting from Arrowhead spring water.
I started to use ArrowHead Spring a day or two after seeing above results.  Now going through a little more than 2.5 gallons or one container a week of Arrow.  I purchased 5 containers and in about a week I'll buy another 5.  Yes its annoying, but I want TDS well below 379.
Basically I quit using filtered water or ice from refrigerator.
As for these filters, there is no way each could possibly bring numbers down to spring water numbers.
I was going to try a Zero Filter but was told with such high TDS in water I would need a new Zero filter every couple of weeks.
If there is a question as to why spend more for one GE replacement or getting 2 for about same price, Well I won't know for a while what GE numbers would be.