https://hiy.netlify.app/enContents © 2026 <a href="mailto:non@existent.com">author</a> Mon, 26 Jan 2026 02:50:51 GMTNikola (getnikola.com)http://blogs.law.harvard.edu/tech/rsshttps://hiy.netlify.app/posts/bifen-additives.htmlauthor<p>Following the suggestion <a href="https://diy.stackexchange.com/a/224737">here</a>, I did a little research and found two options for bug spray: an <a href="https://www.ortho.com/en-us/products/bugs/ortho-home-defense-insect-killer-indoor-perimeter2-refill">off the shelf product</a> or <a href="https://store.doyourownpestcontrol.com/bifen-it">DIY</a>. In terms of per ounce active ingredients, the off the shelf solution is about ~10 times more expensive. I'm wondering if I go the DIY route, are there any additives I should add to increase the retention/longevity of the active ingredients in the perimeter barrier, like surfactants and ammonium sulfate for glyphosate?</p> <p><strong>Answer</strong> With credits to <a href="https://www.reddit.com/r/pestcontrol/comments/nk2q6p/are_there_recommended_additives_for_mixing_bifen/">reddit</a>, there are a few adjuvants to mix with Bifen:</p> <ul> <li> <p><a href="https://en.wikipedia.org/wiki/Insect_growth_regulator">Insect growth regulators</a>: Pyriproxyfen (Nyguard), Methoprene (Precor).</p> </li> <li> <p>Pesticide synergist: <a href="https://en.wikipedia.org/wiki/Piperonyl_butoxide">piperonyl butoxide</a> (Exponent).</p> </li> <li> <p><a href="https://www.solutionsstores.com/wettable-powders">Wettable powders</a> formulations are often longer lasting.</p> </li> </ul>home-diyhttps://hiy.netlify.app/posts/bifen-additives.htmlSat, 29 May 2021 22:11:22 GMThttps://hiy.netlify.app/posts/mansfield-4000-frost-free-faucet-stem-leaking.htmlauthor<p>I have a 12-in Mansfield 4000 series outdoor frost-free faucet (according to <a href="https://www.prier.com/wp-content/uploads/2020/01/mansfield-stem.pdf">this</a>). It's leaking from inside the stem tube (labeled "1") only when water is turned on. Removing the stem from the faucet, I cannot see light from the stem tube end. However, when I carefully dripped water into the stem tube, a little of that water came out from the holes labeled "2". This makes me suspect that there might be a hole (I assume I have to replace the entire stem in this case) or a deteriorated washer inside the stem. Is Prier a new owner of the Mansfield brand? According to <a href="https://www.prier.com/products/400-series/">them</a>, the stem should never leak this way.</p> <p><a href="https://hiy.netlify.app/images/mansfield-4000-frost-free-faucet-stem-leaking/faucet-stem-close-up.jpg"><img alt="faucet stem close-up" src="https://hiy.netlify.app/images/mansfield-4000-frost-free-faucet-stem-leaking/faucet-stem-close-up.thumbnail.jpg"></a></p> <p><a href="https://hiy.netlify.app/images/mansfield-4000-frost-free-faucet-stem-leaking/faucet-stem.jpg"><img alt="faucet stem" src="https://hiy.netlify.app/images/mansfield-4000-frost-free-faucet-stem-leaking/faucet-stem.thumbnail.jpg"></a></p> <p><strong>Answer</strong> It turns out that an o-ring (400/500 Stem End O-Ring in the diagram below) is completely absent. Since there is no leak when water is turned off, the washers should have been fine. When water is turned on, the stem end will be pushed against the thick copper part, thus closing the holes. With the o-ring missing, water drips through the seam, into the holes, and out from the handle thread.</p> <p><a href="https://hiy.netlify.app/images/mansfield-4000-frost-free-faucet-stem-leaking/mansfield-400-series-assembly-diagram.jpg"><img alt="Mansfield 400 Series Assembly Diagram" src="https://hiy.netlify.app/images/mansfield-4000-frost-free-faucet-stem-leaking/mansfield-400-series-assembly-diagram.thumbnail.jpg"></a></p>home-diyhttps://hiy.netlify.app/posts/mansfield-4000-frost-free-faucet-stem-leaking.htmlThu, 18 Jun 2020 00:35:56 GMT