truly thank you for the insight! another question on top of check valves. is it really worth to go the extra step for a roller mat? i dont necessarily mind having filter socks and extras to do replacements. but is it really worth the extra for the roller mat?YES!!!!! This is what i needed. i didnt know the conversion or how big the sump would need to be to accommodate back flow. do people still run check valves? ive seen less and less of them


