If you’re in the market for calcium hardness increaser, you won’t want to miss our Best calcium hardness increaser list in 2023. Our carefully curated selection is based on 26847 customer reviews gathered from all around the world – giving it a truly global perspective!
See what others are raving about now and make sure that your next purchase will be one of lasting value.
SaleBestseller No. 1
SpaGuard Spa Calcium Hardness Increaser - 12 Ounce
- 1 tbs. per 100 gallons raises calcium hardness 25ppm
- Prevents corrosion of equipment due to low calcium hardness
- Prevents etching of plaster due to low calcium hardness
Bestseller No. 2
Clorox Pool&Spa 12204CLX Calcium Hardness Increaser, 4 lb, White
- Increases low Total Hardness levels in swimming pool water
- Prevents corrosion, etching, and staining
- Prevents pool surface damage
- Ideal for plaster pools and soft water areas
- For best results, use with the Clorox Pool app
Bestseller No. 3
Robelle 2825B Pool Calcium Increaser, 25-Pounds (Bag)
- Increases water hardness
- Low calcium hardness level can cause corrosive water
- Prevents the staining or etching of your pool's surface
- Ideal calcium hardness range 200 - 400ppm
Bestseller No. 4
Pool Mate 1-2808B Swimming Pool Calcium Hardness Increaser, 8-Pounds
- Increases Water Hardness
- Low calcium hardness level can cause corrosive water
- Prevents the staining or etching of your pool's surface
- Ideal Calcium Hardness range 200 - 400ppm
Bestseller No. 5
Puri Tech Pool Chemicals 25 lb Calcium Hardness Increaser Plus for Swimming Pools & Spas Increases Calcium Hardness Levels Prevents Staining on Surfaces
- BRAND NEW PACKAGING: All Puri Tech Chemicals now come in resealable bags for easy storage!
- ACTIVE INGREDIENTS: Calcium Chloride
- RAISES CALCIUM in swimming pool water.Calcium Hardness level prevents foaming, equipment and surface erosion and scaling.
- DOSAGE: 2,000 Gallons: 1.5 Lbs to increase hardness 50ppm, 3 Lbs/100ppm, 6.25 Lbs/200ppm. 5,000 Gallons: 3 Lbs to increase hardness 50ppm, 6.25 Lbs/100ppm, 12.5 Lbs/200ppm. 10,000 Gallons: 6.25 Lbs to increase hardness 50ppm, 12.5 Lbs/100ppm, 25 Lbs/200ppm. 20,000 Gallons: 10.5 Lbs to increase hardness 50ppm, 25 Lbs/100ppm, 50 Lbs/200ppm.
- See Package for instructions
Bestseller No. 6
Calcium Hardness Increaser (1 Gallon) Calcium Chloride Powder for Pools & Hot Tubs
- Calcium Chloride Anhydrous Powder Increases Total Hardness of Pool Water
- Used to Prevent Corrosion in Pools & Hot Tubs
- Great Value: 1 Gallon of Calcium Chloride Powder
- Lab-Tested & Certified
- Manufactured in the USA
Bestseller No. 7
Leisure Pool 25 lb. Calcium Hardness Increaser (Calcium Chloride)
- ✅ 25 lb. Pail of Calcium Chloride (Dry Granules) commonly known as Calcium Hardness Increaser, will raise calcium hardness levels in commercial and residential swimming pools and spas.
- ✅ DOSING INSTRUCTIONS: 1.1 lb. per 10,000 gallons will raise CH levels by 10 ppm.
- ✅ OTHER USE(S): ICE MELT, DUST CONTROL, CONCRETE ACCELERATOR
- ✅ 83-87% Pure (Calcium Chloride), Meets ATSM 098 AASHTO M144 Standards
- ✅ Ships in a 25 lb. pail with resealable lid for easy storage.
Bestseller No. 8
Hard UP Calcium Hardness Increaser 10lb Bag
- Rapidly raises calcium hardness in pools and spas
- Also used as Ice Melt
SaleBestseller No. 9
SpaPure Calcium Hardness Increaser 16oz
- Safely raise the calcium hardness levels in your spa water
- Stop and prevent the corrosion of your spa's surfaces
- Compatible with all systems including bromine, chlorine, mineral sanitizers, and biguanide
Bestseller No. 10
AquaDoc | Spa Calcium Hardness Increaser Hot Tub Owners Rely on, Calcium Increaser Spa Hardness Increaser & Calcium Booster for Hot Tubs, Spa Calcium Increaser & Hot Tub Water Hardener Spa Chemicals
- Make balancing your water easier & more cost effective with AquaDoc's calcium hardness increaser. Our spa calcium hardness increaser is vital to ensuring proper water hardness levels in your hot tub. AquaDoc's Calcium Booster gets your hardness up.
- Avoid corrosion, etching, and staining - AquaDoc's Professional Grade Hot Tub Calcium increaser is your best defense against soft water in your hot tub or spa. Guard calcium levels from decreasing too low with our spa Calcium booster for hot tubs.
- How it works - AquaDoc's Hot Tub Calcium hardness Increaser works to raise your water's hardness level to ensure properly balanced hot tub water. Our spa hardness increaser easily works to raise your Calcium levels by 10ppm increments or more.
- The Hardness Increaser Hot Tub Owners Love - When it comes to Spa Chemicals calcium hardness increaser is a must have. Without hot tub chemicals calcium hardness can become unbalanced. Always have a hot tub calcium booster ready and waiting.
- Easy to Use, Made in the USA - (1) Check your calcium levels, (2) 1 ounce of AquaDoc's Calcium increaser will boost water's hardness level by 10ppm. (3) After determining hardness level goal, add proper amount of increaser while equipment is on. (4) Run filter for 1 - 2 hours, wait 20 minutes, then retest water.
Bestseller No. 11
Spa Essentials 32534000-02 Calcium Hardness for Spas and Hot Tubs (2 Pack), 12 oz
- Increases Calcium Hardness Level In Spa Water
- Helps Prevent Corrosion Of Spa Equipment And Surfaces
- Easy To Use
- No Assembly Required
Bestseller No. 12
Leisure Pool 50 lb. Calcium Hardness Increaser (Calcium Chloride)
- ✅ Calcium Chloride (Dry Granules) commonly known as Calcium Hardness Increaser, will raise calcium hardness levels in commercial and residential swimming pools and spas.
- ✅ DOSING INSTRUCTIONS: 1.1 lb. per 10,000 gallons will raise CH levels by 10 ppm.
- ✅ OTHER USE(S): ICE MELT, DUST CONTROL, CONCRETE ACCELERATOR
Bestseller No. 13
Gritt Commercial Calcium Hardness Increaser for Swimming Pools, Hot Tubs, & Spas - Calcium Chloride, Increases Calcium Hardness Levels, Stops Rust, Scales, Pinhole Leaks - 4 lbs
- CALCIUM HARDNESS INCREASER: Water naturally wants to be balanced; high pH, fluctuating temperatures, & evaporation disturb the pool water chemistry. Water, when not treated, balances itself out by drawing calcium by chipping away plaster pool walls, or corroding metal equipment in your vinyl or fiberglass pool, all of which leaves ugly stains on your pool surfaces. Gritt Commercial calcium hardness increaser makes managing pool chemistry easier and more cost-effective.
- IMPROVES POOL HEALTH: Our calcium hardness increaser is made with Calcium Chloride and will raise the total calcium hardness in your pools, spas, and hot tubs. Once added, our Calcium hardness increaser prevents corrosion of your swimming pool metal fittings, deters ugly rust stains, reduces scaly white buildup on the pool surfaces, and stops pinhole leaks in critical pool equipment.
- CONCENTRATED FORMULA: The colder your climate, the more calcium hardness you should have in the water. A 300 ppm calcium hardness is minimum in a hot climate. If your climate can make the pool freeze, 400 ppm is the bare minimum. The colder your climate, the more calcium hardness you should have in the water. Just 1.5 lb. of our product can increase the calcium hardness levels by 50 ppm.
- EASY TO USE: Add this product on the day when no other water treatment chemical has been added. Test water for hardness with a test kit or strip. If the calcium hardness is below 200 ppm, determine the dosage of this product from the table at the back of the bottle. Broadcast product over the entire water surface while the pump is running. Do not pre-dissolve this product. Pool use may resume 15 minutes after the product has fully dissolved.
- KEEPS WATER BALANCED: Calcium hardness stability is a big benefit in water chemistry. Calcium doesn't fluctuate as pH or alkalinity will. Calcium provides a sturdy foundation to balance water around. Our Calcium hardness helps water chemistry behave more predictably and keeps it from attacking metal fittings, heat exchangers, and causing pinhole leaks. Our formula is made safely in the USA.
Bestseller No. 14
Calcium Hardness Increaser, Granular
- Balancer, water hardness increaser
- Odorless
- pH rating 8.3 - 8.4 at 20 deg C
- Solid white flakes
- Solubility 42 wt % (Anhydrous) at 68 deg F
Bestseller No. 15
Natural Chemistry Spa Calcium Hardness Increaser (1.83 lb)
- Boosts the calcium hardness level in your spa or hot tub
- Prevents corrosion damage to spa surfaces, plumbing, and other equipment
- Reduces eye and skin irritation
SaleBestseller No. 16
HTH 67153 Calcium Hardness Up Pods Balancer for Swimming Pools, 8 ct
- BENEFITS: Protects your pool from corrosion that can result from low calcium hardness so you can enjoy splashing in the water all season long in healthy water
- USE: Apply to skimmer or directly to pool for easy DIY pool care; For best results, use with other HTH pool care products
- COMPATIBILITY: Great for all types of pools, including vinyl-lined pools and saltwater systems
- FEATURES: Raises calcium hardness levels; avoids damage to pool and equipment; Pre-measured; Water-soluble
- INCLUDES: One 4-lb pouch of eight pods of Calcium Hardness Up pool care chemicals for your swimming pool water
Bestseller No. 17
Brilliance for Spas Calcium Hardness Increaser - 14 oz (2 Pack)
- Brilliance for Spas Calcium Hardness Increaser (14 oz) (2 Pack)
- Raises Calcium Hardness in Spa Water
- Concentrated Formula
- High Purity, Low Dusting
Bestseller No. 19
Puri Tech Pool Chemicals 50 lb Calcium Hardness Increaser Plus for Swimming Pools & Spas Increases Calcium Hardness Levels Prevents Staining on Surfaces
- Calcium hardness increaser for pool and spa available in resealable bags for easy storage
- Calcium hardness increaser active ingredients: Calcium Chloride
- Raises calcium hardness increaser for pool and spas. Balanced calcium hardness level prevents foaming and surface erosion or scaling.
- DOSAGE: 2,000 Gallons: 1.5 Lbs to increase hardness 50ppm, 3 Lbs/100ppm, 6.25 Lbs/200ppm. 5,000 Gallons: 3 Lbs to increase hardness 50ppm, 6.25 Lbs/100ppm, 12.5 Lbs/200ppm. 10,000 Gallons: 6.25 Lbs to increase hardness 50ppm, 12.5 Lbs/100ppm, 25 Lbs/200ppm. 20,000 Gallons: 10.5 Lbs to increase hardness 50ppm, 25 Lbs/100ppm, 50 Lbs/200ppm.
- Puri Tech pool calcium increaser is a fast acting formula.
Bestseller No. 20
Rx Clear Calcium Plus | Granular Calcium Chloride | Raises Calcium in Swimming Pool Water | Hardness Increaser for Swimming Pools | Helps Prevent Corrosion | 25 Lbs
- CALCIUM PLUS - Use Rx Clear Swimming Pool Calcium Booster when the calcium hardness reading in your pool drops below 150ppm. Raising calcium hardness helps prevent corrosion of metal and plaster surfaces. Also helps prevent foaming of certain chemicals.
- BE AWARE - Do not add this product on the same day that either ph plus or alkalinity increaser has been added to the pool water. Add when water hardness levels drop below 150 ppm. Spread the product over the surface of the water while the pump is running. Do not pre dissolve this product.
- PREVENTS CORROSION - Rx Clear Calcium Plus helps stop corrosion of metal surfaces such as light fixtures, railings, ladders, screws, pool cover components, pool heater components, and metals in your pump or filter. Also prevents etching, pitting, and delamination of concrete, plaster, gunite, shotcrete, and fiberglass pools.
- WATER CHEMISTRY - One of the most important aspects of proper swimming pool care involves the maintenance of balanced water chemistry. When swimming pool chemicals are not at their ideal levels, swimmers can be at risk of contracting illnesses and suffering from skin irritation, the water can turn dull and cloudy, and pool or spa equipment, hoses, and surfaces can become damaged.
- DOSAGE - The ideal range is 200 to 400 parts per million (ppm). Six lbs. per 10,000 gallons will raise the hardness level approximately 50 ppm. The minimum calcium hardness level is 150 ppm. Trust Rx Clear as the most reliable leader in pool cleaner products and supplies.
Our selection of top-rated calcium hardness increaser provides something for everyone, no matter your budget. We’re sure you’ll find the perfect item to fit all your needs!
