The Truth About Trichlor Tablets

Show Notes

Trichlor tablets keep pools clear with slow, steady chlorination, so why do they get blamed for “ruining” pool water? We dig into the real chemistry behind the complaints and separate hard facts from pool-store folklore. If you’ve ever heard that cyanuric acid somehow sticks around after a full drain, or that topping off after evaporation fixes high stabilizer, we walk through why those ideas don’t hold up and where the confusing test results actually come from.

We also get blunt about what many people are never told at the point of sale: trichlor tablets are trichloroisocyanuric acid, and they add a lot of cyanuric acid (CYA) as they chlorinate. Since CYA doesn’t evaporate, it can climb all season, making free chlorine less active at the same reading. We talk through a practical target approach using the common “free chlorine should be about 7.5% of CYA” guideline, and why that can create real headaches for commercial pool operators who must stay under health department chlorine limits.

Then we shift into solutions that let you keep the convenience of tablets without letting stabilizer creep take over: small, scheduled partial drains, using less trichlor by supporting with liquid chlorine or cal-hypo, and water “enhancers” like 50 ppm borates, mineral systems, and phosphate remover plus enzymes to help chlorine last longer. We also cover how heavy rain in some regions can provide meaningful dilution that changes your game plan. Subscribe for more straight talk pool chemistry, share this with a pool owner who’s battling mystery chlorine loss, and leave a review with your biggest trichlor or CYA question.

We clear up the biggest trichlor tablet misconceptions and explain why cyanuric acid readings can confuse even experienced pool owners. We also lay out practical ways to keep CYA and free chlorine in a safe, effective range without giving up tablets.
• urban legend behind high CYA after a drain and refill
• why cyanuric acid testing gets unreliable at high levels
• evaporation removing water but not stabilizer
• trichlor tablets containing about 50% cyanuric acid
• how rising CYA makes free chlorine work slower
• the 7.5% free chlorine to CYA rule and why it matters
• how a season of tablets can drive CYA to 200+ ppm
• partial drains as the simplest stabilizer control
• using liquid chlorine or cal-hypo to reduce tablet use
• borates minerals enzymes and phosphate control to extend chlorine
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