instapure if 10

[mtnwater]

have a whole house filter under the sink. It is instapure IF 10, and shows replacement numbers IR-10, IR-40. I found the IR-10A, but I don't know if it is compatible. The picture looks different.

[waterfilters]

You will need the IR-10, the C-1, and two of the 274300 o-rings to replace the ones between the cap and the sump.

IR-10
http://www.waterfilters.net/Waterpik-IR-10-Under-Sink-Water-Filter_p_0-375.html
The orings can be purchased here as well.

C-1
http://www.waterfilters.net/culligan/wholehouse/replacement_filters/C-1.htm

The C-1 can be replaced with the IR-70E which filters more contaminants than the C-1.
http://www.waterfilters.net/Waterpik-IR-70E-Under-Sink-Water-Filter_p_0-379.html