Blue Thumb 100' Roll Protective Underliner air pump and backwash more easily than

and backwash more easily than standard filter mats

NOTE: Microbe-Lift/BSDT (Broad Spectrum Disease Treatment) is NOT AVAILABLE IN CANADA

5 Year Warranty on Diffusers

Apply every two weeks when water temperatures are above 50°F

Blue Thumb 100' Roll Protective Underliner air pump and backwash more easily thanMPN: PU6100, PU12100 Blue Thumb Protective Underliner Roll Available in 6' and 12' (folded into 6') The use of underliner increases the puncture resistance of rubber liner by 321%! Provides additional tear and puncture protection from roots, stones, or any other sharp objects Provides enhanced soil stability and erosion control Underliner can be used on top of liner as well to protect from punctures when adding gravel & boulders Both 6 wide and 12