16 Best Necessary Pool Chemicals for 2025

Necessary Pool Chemicals for the Season!

If you are a new pool owner, it is super helpful to have a quick reference list of necessary pool chemicals.

I trust you have a decent knowledge about pool chemistry, but if not feel free to check out my article Pool Chemistry for Beginners: With 5 Super Helpful Cheat Sheets!

In this post I have made an easy to refer list of 16 necessary pool chemicals for pool owners. There are links to my recommended products so that you can go ahead and order them online from Amazon.

So let’s get started. Click on the link below to jump to the item that interests you!

  • Pool Water Testing
  • Pool Sanitizer (Chlorine)
  • Shock Treatment (Concentrated Chlorine)
  • Stabilizer (Cyanuric Acid)
  • Pool Water Balancers
  • Algaecide
  • Clarifier
  • Flocculant
  • Sequestering Agent

Pool Water Testing

Before putting any chemical in your pool you must test the current status of your pool chemistry. So get yourself a pool water test kit. There are three options available.

  1. Test Strips
  2. Chemical Test Kits
  3. Electronic Test Kits

Recommended Test Strips

JNW 7in1 Pool and Spa Test Strips

Simply dip the strip into the water for 2 seconds, hold strip horizontally for 30 seconds, and compare with the color chart on the bottle to obtain accurate water results in just seconds.

Click to Order

Recommended Chemical Test Kit

Taylor K-2005 Complete DPD 9-in-1 Test Kit

Tests for free & total chlorine, bromine, pH, total alkalinity, total hardness, and cyanuric acid (CYA) levels.

Click to Order

Recommended Electronic Test Kit

Ultimate Pool Water Tester

Comprehensive 27-parameter water testing for pools and hot tubs, ensuring crystal clear, safe, and perfectly balanced water.

Click to Order

Pool Sanitizer (Chlorine)

Without doubt, the most critical chemical for your pool is the “Sanitizer”. Your pool will have a a continuous influx of contaminants, bacteria, virus, algae and other microorganisms. Many of them are harmful.

A pool sanitizer is the chemical that fights and neutralizes the pathogens. There are a few choices, but chlorine is by far the most common.

1. Pool Sanitizer (Trichlor)

HTH 42055 Pool Care 3″ Chlorine Tabs Advanced

Sanitizer, clarifier, and algaecide to protect your swimming pool and swimmers with one easy and convenient tab.

Click to Order

Shock Treatment (Concentrated Chlorine)

In terms of chemical composition regular chlorine and “shock” are pretty much the same thing. The difference is in the concentration, rate of release and the objective.

While regular chlorine is released in the pool at a slow steady pace to keep the FC level within 1 – 4 ppm, shock is hyper chlorination. Pool shock is intended to spike up the FC level of the pool to around 30 ppm.

2. Cyanuric Acid Free Shock (Cal Hypo) – Powder