EPA vs. Sodium Bromide: The Real Story Part 1 of 2

The EPA’s sodium bromide relabeling decision didn’t just tweak a bottle panel, it pulled a familiar algae treatment tool out of the outdoor pool conversation overnight. We’re joined by Scott Hamilton, the CEO of United Chemical to explain what the EPA’s interim decision actually says, why “not for use in outdoor pools” now shows up on sodium bromide-based algaecides, and how that single change ripples through distribution when big suppliers decide they won’t stock the category at all. From there, we get practical and technical. Scott walks us through worst-case outdoor testing designed to stress the chemistry: high pH, zero cyanuric acid (CYA), and heavy liquid chlorine dosing in above-ground pools. We talk bromate formation, why the EPA leans on conservative assumptions like 100% conversion, and what the real-world data shows instead, including the striking difference between treating a pool with active algae versus clean water. If you’ve ever wondered why timing matters, we dig into the “first hour” window where most bromate formation tends to occur and what actually drives the reaction. We also zoom out to risk, regulation, and perception: how Prop 65 style warning logic shapes the conversation, how the EPA swim model estimates ingestion exposure over a lifetime, and the question every pool pro asks, why hot tubs still get a pass while outdoor pools don’t. Subscribe for part two, share this with a pool pro who’s navigating algae season, and leave a review with your take on the ruling.We sit down with Scott Hamilton from United Chemical to unpack the EPA’s interim decision that forces sodium bromide products to remove outdoor pool use from their labels and triggers major supply chain fallout. We dig into bromate formation, what worst-case testing actually shows, and why the first hour after dosing becomes the key battleground in the chemistry debate.  • who the interim decision affects and why labels now read not for outdoor pools  • why Pool Corp and others stop carrying sodium bromide products  • how the EPA reaches decisions when it does not run its own controlled lab tests  • worst-case outdoor testing design using high pH, zero CYA, and heavy liquid chlorine  • what the data shows with algae present versus clean water  • why most bromate formation happens in the first hour  • how proprietary ingredients can suppress bromate formation  • how Prop 65 and linear risk models shape public perception  • why hot tubs get treated differently under the EPA exposure assumptions  Are you a pool service pro looking to take your business to the next level? Join the pool guy coaching program. Learn more at Swimmypoollearning.com. If you're interested in the coaching program that I offer, you can learn more at ProGuideCoaching.com.  Download the full Sodium Bromide Study:https://drive.google.com/file/d/1X6-1uJJ7MZugeRDpch0tpop2vg0hjPR0/view?usp=sharingSend us Fan MailSupport the Pool Guy Podcast Show Sponsors! HASA https://bit.ly/HASAThe Bottom Feeder. Save $100 with Code: DVB100https://store.thebottomfeeder.com/Try Skimmer FREE for 30 days:https://getskimmer.com/poolguy Get UPA Liability Insurance $64 a month! https://forms.gle/F9YoTWNQ8WnvT4QBAPool Guy Coaching: https://bit.ly/40wFE6ySupport the showThanks for listening, and I hope you find the Podcast helpful! For other free resources to further help you:Visit my Website: https://www.swimmingpoollearning.comWatch on YouTube: https://www.youtube.com/@SPLPodcast Site: https://the-pool-guy-podcast-show.onpodium.com/UPA General Liability Insurance Application: https://forms.gle/F9YoTWNQ8WnvT4QBAPool Guy Coaching GroupJoin an exclusive network of Pool Service Technicians to access the industry’s leading commercial general liability insurance program. Protect your business.Premium is $64 per month per member (additional $40 for employees and ICs)$59 per month for Pool Guy coaching Members - join here! https://www.patreon.com/poolguycoachingLimits are $1,000,000 in occurrence and $2,000,000 in the aggregate - Per member limits     [ $1,000,000 per occurrence and $4,000,000 aggregate available for $75 per month ]$50,000 in HazMat Coverage - clean up on-site or over-the-roadAcid Wash Coverage - Full Limits