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Best Chlorine for Vinyl and Fiberglass Pools – Buying Guide

For the care and maintenance of your pool, you must know which chlorine products are best and affordable for vinyl and fiberglass pools. Finding the best chlorine for a vinyl and fiberglass pool is to maintain your pool’s pH and prevent harmful microorganisms from sanitizing your pool.

Most pool cleaners prefer liquid Chlorine to powder form chemicals because it maintains and raises chlorine levels quickly without increasing the stabilizer.

So, let’s start learning a comprehensive guide about the best chlorine for vinyl and fiberglass pools in 2022. Below are some we will describe in detail with positive and negative impacts. 


5 Best Chlorine for Vinyl and Fiberglass Pools

Here are some products with features and pros and cons. You have to decide which suits your requirements well. 

Let’s scroll down and read it carefully. 


9.4/10 Our Score
  • Calcium hypochlorite
  • 1 lb/13500 gal
  • Take 24 hours
  • 1 lb x 6
  • Compatible with salt water.
  • 4-in-1 treatment


This is the best treatment for pool cleaning. HTH Super Shock consists of the 4-in-1 strong pool shock intended to help to maintain chlorine levels. It also helps to prevent pools from bacteria and algae. It’s an affordable treatment that makes safe and healthy pools and water. 

HTH Super shock is the best Chlorine for Vinyl and fiberglass pools. How does it work? It can treat up Upto 13500 gallons in just 24 hours and reestablish precious stone clearness quickly. It’s 100% clean of the pool water and entire pool liner without damaging it. HTH Super shock will perform every job incredibly for all pool types.  

HTH was created in light of the shopper that consists of prudent and vital items for the most challenging positions that prevent your pool from any bad position. Pool shocking treatments are practical and suitable for every type of pool, whether fiberglass or vinyl.  

How to use HTH super Shock? 

First, test the chlorine level in your pool water and determine if it is in the range of 1 to 4 ppm. If it is less than high, between 1-4 ppm, then apply shock treatment to your pool consistently. 

Remember: When you apply shock treatment, the chlorine level increases immediately. Don’t worry if it happens in this case because this method will kill the harmful bacterias that are harmful to your pool and clean your pool water. So enjoy your swimming without any doubt. 

HTH super Shock consists of bag packets. 1 bag of this product treats 13,500 gallons. The shock treatment applies directly to the pool. Continue this process weekly and make your pool free of available chlorine. It is a very helpful and most demanding product in the market that can easily and quickly maintain a level between 1 and 4 ppm.

However, it offers all you want for your pool, from algaecides and stores, control recipes to non-chlorine shock medicines, strong surface cleaners, clarifiers, catalyst-based cleaners, etc.

  • This product is very safe to use.
  • Increase chlorine level
  • It kills bacteria and prevents pool liners from blurring.
  • Instantly work and give output in just 24 hours.
  • Keeps water neat and clean
  • Takes time to use


9.4/10 Our Score
  • 55.5% chlorine
  • 5-6 tbsp/800-1000 gal
  • Take 24 hours


The granule cleaning products are very effective and quickly break down. The instant work to kill bacteria, and microorganisms, destroy organic impurities and prevent spa water from algae.

How does it work? 

This granule-based chlorine works as a safeguard against bright radiation from the sun.

And increase the chlorine level in your pool rapidly, which will kill all germs, control the development of green growth, kill microorganisms, and annihilate natural impurities.

If you are using it for the first time, you must know the proper guidelines for perfect applications.

If hold holds 19,000 gallons, you need 5-6 tablespoons after each use and keep the water clear and level readings.

Spa Sanitizing Granules works the same as chlorine and disintegrates rapidly and totally. It is very helpful to clean water and make it healthy and safe for kids and all ages when they use the swimming pool. 

Spa sanitizer helps to re-oxidize the compounds such as ammonia, perspiration, and suntan lotion and Remove the chloramines and bromides, which cause chlorine odor.

The spa sanitizer granule completely dissolves in just a few minutes and is a very helpful formula for controlling algae.

  • Excellent products keep the water balanced
  • Effectively work for extremely algae pool water
  • Perfect for hot tub
  • Granule Quickly dissolves
  • 55.5% chlorine
  • Expensive


9.4/10 Our Score
  • Available in 50 lbs
  • The tablet size is 3 inches
  • 90% available chlorine
  • Only one tablet for / 5000-8000 gallon


The Swim 3 Inch Chlorine Tablets work as magic for high against high algal growth and bacteria. This is created in a thicker form than other pool chlorine tablets. It dissolves completely and quickly in just a few seconds. 

Each 3 inches chlorine tablet is the best for your floaters or programmed feeders. These products are most suitable for hot tubs and small pool areas. These chlorine tablets have 90% accessible balanced-out chlorine for enduring disinfecting power and floaters.

It works longer and protects your pool from sunlight. These chlorine tablets may differ in packaging, but the results are the same. In general, the capacity of cleaning depends on pool types. Stabilized chlorine tablets last two to three days. 

How does a 3 inches chlorine tablet work? 

One 3-Inch tablet of Chlorine works instantly for any type of pool construction and conditions. It will treat up to 5000 gallons of water. Use the tablet according to your pool size.  

First of all, test the pool water level and how much volume of your pool. It should be between 4000-5000 gallons.

Suppose your pool has, if your pool has a 10 000 capacity of a gallon, then you need 2-3 tablets. So, put chlorine tablets in the pool after determining pool volume. You can use a Floating Chlorine Dispenser, add a tablet to it and dissolve the chlorine tablet slowly. 

After a few minutes, rub against liners and bleach them. You can see the result and prove their compatibility against dirt, germs, and algae.

If you don’t have a floating chlorine dispenser, you can use a Skimmer and add a tablet to it. 

 It is better to add the chlorine tablets directly to your skimmer basket. The water constantly runs from the slimmer basket, which results in you will get quickly and the chlorine tablet dissolving much faster.

  • Perform an excellent job against algae and
  • bacteria in your pool water.
  • Safe and healthy pool water after one-time use.
  • 3-inch chlorine tablets are ideal for large pools.
  • Clear and clean output and free from all types of algae.
  • It helps to kill all types of bacteria.
  • The very expensive choice for household water pools


9.4/10 Our Score
  • 73% accessible chlorine shock recipe
  • kill bacteria, microorganisms, and algae from the pool
  • works efficiently within 24 hours
  • deally, removes all harmful bacteria from your pool water


This is one of the strongest products to kill bacteria, microorganisms, and algae from the pool and make the pool water clean and healthy for kids, pets, and others. 

This product treats vinyl and fiberglass pools, cleans the pool liner properly, and makes it safe and durable.

This Swim’s super pool shock is a strong 73% accessible chlorine shock recipe. That works instantly when preventing pools from green growth and other harmful substances from your pool.

This multipurpose product is used to sanitize pool water and clear it more than filter systems. 

How does the super Shock method work? 

First, you need to know what amount you need to use for the required pool water. Suppose your pool has a 10,000-gallon capacity. You require one pound for each 10,000 – 13,500 gallons of pool water.

This super Shock comes with granule packaging that works efficiently within 24 hours. However, The swim super Shock is the most demanding product in the US. 

The super Shock system is different from chlorine. Shock has a more extreme compound strength than chlorine, depending on the purpose and specific use.

After applying the super Shock application, you should run the filter and clean the swimming pool properly. It is better to run filters 4-6 hours after shocking them. It helps clean water and gives the shock enough time to mix with the pool water thoroughly.

We suggest using a shocking method once a week and running the filter for 6 hours weekly.

  • A powerful and effective Chlorine Shock Treatment
  • It efficiently turned cloudy water into clean and clear water.
  • Quick method
  • Ideally, removes all harmful bacteria from your pool water
  • Great and ideal product for regular maintenance.
  • Shock treatment in excessive amounts will produce more algae from chlorine, which might oxidize the copper in water.


9.4/10 Our Score
  • 24 bags (1-pound each)
  • Quick-Dissolving Swimming Pool Sanitizer
  • 68% calcium hypochlorite
  • Recommended Dosage: 1 pound per 10,000 gallons of water


DryTec is a well-known brand that produces quality products. One of them is DryTec 1-1901-24 calcium hypochlorite, used for pool cleaning. This product is used for the multipurpose of cleaning water and is mostly used in pool water cleaning treatments to control the green growth and oxidize chloramines and synthetics. This granule is made with High-strength calcium hypochlorite 65%. And use for specific pool water conditions.

Before starting an application, you should check the chlorine level, and the pool water chlorine level should be between 1.0 and 4.0 ppm. 

How does DryTec work?  

This product comes in a packet, and in one bag, you will get 24 packs for each pack size 1 pound. So when you use it, Use the whole substance of the pack when opened.

When you plan to clean pool water, you must know the current water volume in the pool. We recommend using 1 pack of DryTec in 10,000 to 130000 gallons. And if you have up to 13000-gallon water capacity, then add according to the water quantity. 

However, when you add a pack into the pool water properly. Assuming any granules settle to the lower part of the pool, use a brush to scatter. 

However, each pack of 20 ounces of calcium hypochlorite will raise the chlorine level by 10 ppm in 10,000 gallons of water.

After adding the pack, wait 20 minutes to an hour to adjust synthetic substances. After the application, run the filter and don’t swim for the next 24 hours. After 24 hours, the chlorine level will be 3-4 ppm, and you can swim. 


  • Long shelf life
  • Easy to use
  • Cost-effective
  • High efficiency
  • Higher Dissolution Rate Than Stabilized Bromine



FAQs About The Best Chlorine for Vinyl and Fiberglass Pools 2022


Which is better, Liquid or Granular Chlorine?

Liquid chlorine is mostly used for vast swimming pools are more effective than granule products. Liquid chlorine is more efficient for instant dissolution than granules. Granules take time for complete dissolution. Liquid chlorine might be a decent decision if you want wallet-friendly products.


While the granule chlorine is expensive and the accessible chlorine per pound could imply that chlorine granules are the better choice. 


Eventually, liquid and granules both work the same and are effective and demanding products in the market. They both keep your pool spotless and clear.

Can Chlorine Granular be used instead of Tablets?

Granule products take time for proper blending in large swimming pools. Chlorine granules are best for hot tubs and small swimming pools. 

However, for this reason, we suggest chlorine tablets that solve instantly and kill microorganisms significantly more rapidly.

What is the best way to Prevent Algae Growth from Pool water?

The best way to control green growth is to keep your water chlorine level between 2 -4 ppm. This is realizable reading and makes your pool water safe and healthy if you properly maintain the pool every week. Proper maintenance also increases the lifespan of pool liners and their accessories.

Does Chlorine Damage Vinyl?

No, when you use the best chlorine for vinyl and fiberglass pools, they immediately increase the chlorine level in the water, killing harmful bacteria and controlling algae growth. After 2r hours, the chlorine level was maintained, and the water thoroughly. This process doesn’t claim in history that the Chlorine damaged the vinyl. The chlorine will keep your pool liner safe and durable. 

What are Vinyl Pools?

Vinyl is a plastic that is made by comprising ethylene and chlorine to create polyvinyl chloride. That material is mostly used for flexibility and the floor. This comes from the roll form, commonly known as the PVC roll. This is 2 to 4 inches thick and used to line in-ground and above-ground swimming pools.

It keeps the pool water over-chlorinated because it’s made of chlorine components. 

The bleaching products might damage the vinyl and fade out the color of the vinyl sheet due to high bleaching properties and combined with vinyl chlorine chemicals. 

What are Fiberglass Pools?

A fiberglass pool is a molded shell of fiberglass coated with a Gelcoat. It is sturdy in a structure like a pool slide. It’s more durable than vinyl and is not affected by any chlorine. 

For extra care of the pool to prevent it from fading and staining, you must use pre dissolve pool shock. Simply use a bucket filled with water and add pool shock instead of using it directly into the pool. 



In short, after reading about the best chlorine for vinyl and fiberglass pools, we hope you will find the best ones that suit your pool liner and make your pools safe and healthy for use by using them. The maintenance of fiberglass and vinyl pools differs from other types of pools like concrete. If you follow proper guidelines to protect pools from rust, chlorine water, and other damages, you can save your liner will continue to serve you for years to come.


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