Water Testing

Understanding and Controlling Black Algae in Swimming Pools

Black algae is persistent. Follow these steps to remove it and prevent its return.

Swimming pool with concrete steps descending into clear blue water

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Industry Spotlight: LG Electronics

LG Electronics

Advances in compressor technology are helping manufacturers move beyond the traditional capacity range of residential pool heat pumps, creating new possibilities for larger pools, faster heating and cooling, and a broader range of applications.

Industry Spotlight: LG Electronics

TDS: A Number in Search of a Meaning

A closer look at why TDS is not a pass/fail number, but a reading that depends on what is actually dissolved in the water.

Science experiment comparing electrical conductivity in salt water versus sugar water using electrodes and a battery

PHTA-11: Setting the Standard for Water Quality

Pool & Hot Tub Alliance

The standard provides recommended guidelines for water quality parameters in public swimming pools, spas and hot tubs.

Transitioning From Opening to Mid-Season Pool Care

As summer heats up, so does pool water — and without adjusting for temperature swings, your chemistry can quickly fall out of balance.

Split-screen pool scene showing winter and summer with pool maintenance and swimming

Just the Facts: Legionellosis, Legionnaires' Disease and Pontiac Fever

Methods to avoid exposure to Legionellosis, Legionnaires' Disease and Pontiac Fever, as well as what to do during an outbreak.

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Radio Waves Clean Pools

New technology causes particles to clump and floc, supercharging filtration and helping keep pool water pristine.

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Just Above the Waterline

Deposits are not the result of chemical imbalance, but simple evaporation.

The white deposit just above the waterline in this photo is primarily the result of simple evaporation.

Drain Saver Pool Chemistry

The way we approach CyA, TDS and calcium can conserve water and ease drought conditions.

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How to Get Algae to Give Your Pool a Bad Review

Algae control in swimming pools demands a multifaceted approach.

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Test the Water

Regular, repeated water testing is the most important safety precaution that pool operators can take to prevent RWIs.

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Spa vs Pool Chemistry

A spa is not a small swimming pool. Reactions happen faster in warmer water, placing even more dependence on the need to maintain sanitizer levels.

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Research Update: CYA Removal Method Confirmed

A new method of CYA removal has been confirmed with a helpful bonus — it also aids in black algae reduction.

In some trials, black algae literally detached from pool walls to be vacuumed up with debris.

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