Chlorine tablets can feel like the simplest path to a clean pool, until the water starts fighting back. We dig into what really happens when trichlor becomes the main sanitizer: cyanuric acid (CYA) climbs, chlorine gets “slower,” and algae can show up even when your test kit says the free chlorine looks fine. We walk through the practical chemistry behind it, including why CYA is more than just “sun protection” and how a rising stabilizer level changes what a safe chlorine target should be.

We also share a clear rule of thumb for pool care that helps service techs and homeowners stop guessing: aim for free chlorine at roughly 5% of your cyanuric acid level (often described as a 20:1 CYA-to-chlorine relationship). That simple ratio explains why a pool that was stable at 50 ppm CYA can suddenly struggle at 100 ppm CYA unless chlorine targets rise. Along the way, we talk about balancing side effects, like trichlor’s acidity pushing pH and alkalinity down, plus how high CYA can complicate total alkalinity readings when you’re trying to keep water steady week to week.

Then we switch to the safety side of pool maintenance, because the risks are real. If you ever consider swapping trichlor tablets for cal hypo tablets, you need to hear this: mixing them, especially inside a feeder with a little water present, can trigger heat, toxic gas, and an explosion. We also cover gassing buckets, feeder blowback, and storage habits that reduce exposure to dangerous fumes.

If you want fewer chemistry surprises and a more stable pool plan, listen through to the end, then subscribe, share this with a pool owner or tech, and leave a review so more people handle pool chemicals safely.

We break down why trichlor tablets can quietly destabilize pool chemistry, especially as cyanuric acid rises and chlorine becomes less effective. We also get blunt about real-world safety hazards, including gassing buckets and the explosion risk when cal hypo and trichlor are mixed.  
• trichlor as a workable sanitizer that becomes risky as a sole source  
• cyanuric acid buildup slowing chlorine and allowing algae despite “good” readings  
• using a chlorine-to-CYA target around 5% to keep water safe  
• higher CYA forcing higher chlorine targets and creating a runaway cycle  
• trichlor acidity driving pH and alkalinity down over time  
• subtracting a portion of CYA from total alkalinity to estimate carbonate alkalinity  
• cal hypo and trichlor mixing dangers including explosions and fire  
• handling and storage safety for tablets, feeders, and buckets to avoid gas exposure  
• why long-term success looks like stable weekly chemistry, not constant correction  
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