John from Harrisburg, Pa writes
NyGuard is 10% pyridine and Archer is 1.3% pyridine. Which one is more effective? NyGuard comes in 140 ML and Archer comes in a pint(460 ML), however NyGuard is much more expensive.
Nyguard is sold in a more concentrated form, but you will dilute down to the same usage rate as the Archer if you follow the product label, .01-.03%. You will get the same results when using either product.
Answer last updated on: 07/27/2015