It’s the End of the Pool Season! How many chemicals do I need to buy?

psw blog end of season

The quick answer is: it depends on your pool and weather! Here are 10 chemicals that can be useful to your pool closing and winterizing for the off season.



This quick dissolving and powerful shock formula is great for everyday usage. Yes, “everyday” does include the winter off-season!

di chlor shock


  • Fast-dissolving granular shock
  • Pre-mixing not necessary
  • 56% available chlorine

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This chlorine free shock will allow you to quickly, safely and effectively shock your pool without adding any additional chlorine. The other glorious by-product is NO chlorine smell!

chlorine free granular pool shock


  • Chlorine-free Granular shock
  • Active ingredient: 45% Potassium Monopersulfate
  • For the treatment of organic pollutants, bacteria, and algae

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Powerful fast-acting formula eliminates algae blooms which are still very possible during sunny winter months.

pool algaecide
  • Kills black, green, blue or mustard algae on pool plaster surfaces
  • Non-metallic, non-foaming/li>
  • Not affected by pH levels

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easycare algatec algae remover
  • Quickly and effectively removes algae
  • Kills most algae within 4-24 hours
  • Clarifies your pool water

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    • Robarb Super Blue Cloudy Pool Clarifier



The most effective aid to cleaning your pool. Getting your pool ready for winter requires very clean water. This product will latch itself onto organic compounds that allows the particles to be filters much easier.

robarb super blue pool clarifier


  • Non-Toxic & Non-Irritating
  • Improves filter efficiency
  • Helps prevent future cloudy water

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    • Pool Magic+PHOSfree



A phosphate reducer is vital to opening and closing a pool. The enzymes will break down organic debris to make opening and closing fast and easy.

natural chemistry pool magic


  • Specifically formulated for cold water application
  • Can be used under pool winter covers, ideal product for mesh covered pools
  • End of season application reduces off season scum line and staining of pool surface by organic contamination

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    • METALfree



By eliminating trace metals in your pool water, METALfree aids in reducing staining and discolouration and helps prevent scale build-up.

natural chemistry metal free


  • Phosphate free!
  • Powerful formula chelates iron, copper, and other trace minerals.
  • Protects against surface staining and water discoloration caused by metals in pool water

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  • AquaChek Test Strips


We suggest using AquaChek 541604A Select Test Strips that test for total hardness, chlorine, bromine, free chlorine, pH, alkalinity and cyanuric acid (stabilizer). These strips test total water composition, unlike simpler four-way strips.

aquacheck test strips


  • Comes with 50 test strips; refills available
  • A 24-page Pool and Spa Care and Treatment Guide with test log
  • Easy to use and accurate!

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  • Taylor Technologies Water testing kit or TFTestkits




A complete test kit featuring distinct color changes to eliminate guessing and .75 oz. easy application bottles for accurate treatment doses, the Taylor Complete Chlorine Pool and Spa Water Test Kit is used by both professionals and homeowners.

taylor technologies water test kit
  • Tests for total alkalinity, free and combined chlorine, cyanuric acid, calcium hardness, and pH
  • Measures free chlorine (FC) levels as high as 50 ppm
  • Includes case, water guide booklet, and circular watergram

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tf test kits
  • Tests for free chlorine (OTO and FAS/DPD), pH, combined chloramines, calcium hardness, total alkalinity, and cyanuric acid
  • Measures free chlorine (FC) levels as high as 50 ppm
  • Includes waterproof step-by-step instructions

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  • Non-Toxic-Anti-Freeze




Pool Antifreeze gives you great winter protection for your plumbing. This antifreeze is concentrated so 1 quart mixed with 3 quarts of water will make 1 gallon of antifreeze that will protect pool plumbing down to -40° F. A must have for the states that get well under freezing temperatures. This will not only save your pool, but your equipment as well.

polarshield pool antifreeze


  • Concentrate – One quart mixed with three quarts of water will make one gallon of antifreeze
  • Safe for All Types of Pool Plumbing
  • Non-Toxic

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  • Winterpill




The winterizing pill is designed to preserve your water chemistry and reduce winter pool maintenance, ultimately saving you money!

aquapill winterpill


  • One pill lasts up to six months
  • Contains a clarifier, scale inhibitor, stain inhibitor, and enzyme enhancement
  • Designed for pools up to 30,000 gallons, but simply use additional WinterPills for larger pools

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Want your pool opening to be easier than last year? Maintaining your pool water chemistry during the off winter season will help the opening for the summer months. The water chemistry is essential to opening and closing your pool.

Happy Swimming!

Bonus links-

PoolSupplyWorld 3 Inch 50 lb Pool Chlorine Tablets Bucket (Tri-Chlor)
Winter Pool Closing Chemical Kits

For additional information on winterizing your pool you can also visit our WINTERIZING page and the blog link below!

Top 10 Winterizing Products

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When Kevin’s not enjoying the water himself he’s engaging himself in the wide world of pool and spa knowledge which he passes on to our customers through producing content for our blogs and website. Outside of the pool world you can find him enjoying life with friends, family and his off the wall dog Brixton.