Notes from the deep end

Practical articles for pool owners on skimming, water testing and choosing the right equipment.

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143 articles

Water Chemistry · Archive date: · 3 min read

How Much Shock to Open a Pool? Start With Testing, Not Guessing

There is no one-size-fits-all amount of pool shock. Test the water, clean debris first, and follow the product label for your pool size and condition.

Written for PoolSkimmer on Oct 23, 2026; assigned an earlier archive date, not published on that date.

Water Chemistry · Archive date: · 3 min read

How to Increase Calcium Hardness in a Pool

Test the pool water first, then raise calcium hardness with a pool-safe calcium product labeled for that use. Recheck pH and total alkalinity, and call a pro if water stays aggressive or scale-prone.

Written for PoolSkimmer on Oct 23, 2026; assigned an earlier archive date, not published on that date.

Water Chemistry · Archive date: · 3 min read

Signs of a Phosphate Problem in Pool Water

High phosphates can feed algae and make clear water harder to maintain. Learn the warning signs, what to check first, and when to call a pool professional.

Written for PoolSkimmer on Oct 7, 2026; assigned an earlier archive date, not published on that date.

Water Chemistry · Archive date: · 3 min read

How to Tell Whether Your Pool Water Needs Oxidation or Filtration

Cloudy water, odor, and debris point to different fixes. Learn when your pool needs filtration, oxidation, or both—and when to call a pro.

Written for PoolSkimmer on Oct 7, 2026; assigned an earlier archive date, not published on that date.

Water Chemistry · Archive date: · 3 min read

Why Rain Changes Pool Chemistry So Fast

Rain can dilute chlorine, shift pH, and add debris fast. Learn what to check first after heavy rain and when to call a pool professional.

Written for PoolSkimmer on Oct 7, 2026; assigned an earlier archive date, not published on that date.

Water Chemistry · Archive date: · 3 min read

How to Balance Pool Water After Adding Fresh Fill Water

Fresh fill water can shift pH, alkalinity, calcium hardness, and sanitizer demand. Follow a safe test order, adjust slowly, and know when to call a pro.

Written for PoolSkimmer on Oct 7, 2026; assigned an earlier archive date, not published on that date.

Water Chemistry · Archive date: · 3 min read

What Causes Pool Water to Turn Dull After a Chemical Addition?

If pool water turns dull after a chemical addition, the cause is often a chemistry shift, fine particles, or weak filtration. Here’s how to check it safely.

Written for PoolSkimmer on Oct 7, 2026; assigned an earlier archive date, not published on that date.

Water Chemistry · Archive date: · 3 min read

When you shock a pool, how long before swimming?

Don’t go by time alone. Wait until the shock product label allows reentry and your water test shows the sanitizer is back in the safe range.

Written for PoolSkimmer on Oct 23, 2026; assigned an earlier archive date, not published on that date.

Water Chemistry · Archive date: · 3 min read

Can you convert a chlorine pool to a saltwater pool?

Yes, many chlorine pools can be converted to saltwater, but the change usually means adding a salt chlorination system and checking pool equipment first.

Written for PoolSkimmer on Oct 23, 2026; assigned an earlier archive date, not published on that date.

Water Chemistry · Archive date: · 3 min read

How long to wait after adding chlorine to a pool

How long you need to wait depends on the chlorine product, circulation, and test results. Swim only when the label says it is safe and the water is in range.

Written for PoolSkimmer on Oct 23, 2026; assigned an earlier archive date, not published on that date.

Water Chemistry · Archive date: · 3 min read

What to Do If Chlorine Is Too High in a Pool

If pool chlorine is too high, stop adding sanitizer, keep circulation going, retest the water, and wait to swim until levels return to a safe range.

Written for PoolSkimmer on Oct 24, 2026; assigned an earlier archive date, not published on that date.

Water Chemistry · Archive date: · 4 min read

How to Protect a Vinyl Pool Liner from Harsh Water Balance

Protect a vinyl liner by keeping pool water stable: test often, manage pH, alkalinity, chlorine, and calcium hardness, and correct issues early.

Written for PoolSkimmer on Oct 7, 2026; assigned an earlier archive date, not published on that date.