Can this be used to replace the "candy cane" top of the septic vent in my yard?

We replaced ours with it. Fits and works perfectly.

Is there a trick to opening and closing the top? I just received mine and the top does not turn either way

Try pushing down a bit and twist it. There may be arrows showing which way to turn to remove as well. I've never had a problem removing the tops.

How long does it last until the carbon has to be replaced?

Here is a historical-type answer: I can tell you that I installed this on my rooftop sewer vent in September 2002. It completely eliminated the strong sewer gas odor that permeated the neighborhood (especially on rainy days). I lived in the house until July, 2014 and did not change the carbon out a single time because the smell never returned.

ASIN	B00COU0K2C
Brand	SWEET AIR
Date First Available	28 March 2014
Item Weight	113 g
Item model number	VS-TT
Manufacturer	Sweet Air
Manufacturer Part Number	VS-TT
Model	VS43-4
Product Dimensions	17.02 x 17.02 x 20.32 cm; 113.4 g

SWEET AIR Vent Stack Filter, ABS, Black

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