Bob Lowry Breaks Down the Most Powerful Chlorine for Pools

“Liquid chlorine is weak” might be the most expensive pool myth on the internet. We dig into the real meaning of “available chlorine” and why the percentage on the label can mislead you when you compare liquid chlorine to trichlor tablets, dichlor, or cal hypo. With Bob Lowry guiding the chemistry, we translate confusing terms like weight percent and trade percent into something you can actually use: how much usable chlorine you’re putting in the water.

We also talk about the hidden part of every chlorine choice: the byproducts. Liquid chlorine ultimately adds salt, cal hypo adds calcium, and dichlor and trichlor add cyanuric acid, and each of those can create problems if you don’t plan for buildup. If you’ve ever wondered why your pool chemistry “drifts” over time, this is the missing link between sanitizer choice and long-term water balance. 

Salt water chlorine generators get a full reality check too. A salt pool still uses chlorine because the cell makes chlorine gas that becomes hypochlorous acid in the water. We cover output limits, why incorrect voltage or current can keep a system from producing enough chlorine, why salt residue can be corrosive after evaporation, and why bonding matters more than most people realize. We also clear up a common mistake: boost mode doesn’t shock a pool, so we explain what to do when you need chlorine fast. 

• why chlorine percentages on labels don’t compare evenly across products
• weight-to-weight vs trade percent vs volume-based strength terms
• a simple rule of thumb for liquid chlorine strength per gallon
• why chlorine gas is used as the comparison standard
• how trichlor’s “available chlorine” number gets calculated
• what each chlorine type adds to the water: salt, calcium, cyanuric acid
• how salt water chlorine generators make chlorine gas in the cell
• why low voltage or wrong current reduces chlorine production
• salt level targets and why salt residue becomes corrosive after evaporation
• bonding and grounding to reduce electrolysis risk
• why pH rises in salt pools from sodium h

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