Customer Review

Reviewed in the United States on June 15, 2018
The 3M AP904 Whole House Filter works as described, but the Watts WH-LD prefilter it says to purchase should be a Culligan WH-HD200-C Whole House Heavy Duty 1" Inlet/Outlet Filtration System. This is what should be used because it has a 1” NPT inlet & outlet which is the same as the 3M AP904 whole House Filter. The Watts WH-LD has a 3/4” NPT inlet & outlet which means if it’s used as a prefilter it would restrict the flow to the AP904. I ended up returning the Watts WH-LD filter for this reason, I didn’t read the specs on the Watts since I figured if they said it was purchased with the 3M AP904 it should be correct.
Customer image
5.0 out of 5 stars The Watts WH-LD restricts the flow to the 3M AP904 Whole House Filter
By Frank Zappettini Jr on June 15, 2018
The 3M AP904 Whole House Filter works as described, but the Watts WH-LD prefilter it says to purchase should be a Culligan WH-HD200-C Whole House Heavy Duty 1" Inlet/Outlet Filtration System. This is what should be used because it has a 1” NPT inlet & outlet which is the same as the 3M AP904 whole House Filter. The Watts WH-LD has a 3/4” NPT inlet & outlet which means if it’s used as a prefilter it would restrict the flow to the AP904. I ended up returning the Watts WH-LD filter for this reason, I didn’t read the specs on the Watts since I figured if they said it was purchased with the 3M AP904 it should be correct.
Images in this review
Customer image
Customer image
28 people found this helpful
Report abuse Permalink

Product Details

4.6 out of 5 stars
4.6 out of 5
443 global ratings