• Pools

FROG® Algae Blocker 4Pro™

Award-winning Drop ‘n Go™ Algae prevention! Effective. Efficient. Protect your profits and your reputation with reliable water care.

  • Prevent & kill algae faster, easier, and more efficiently
  • Prevent future outbreaks for up to 6 months
  • Save time and money—boost performance and profits
  • No measuring, no spilling, no leaking
  • EPA Registered

Pool water should never have a color — especially if that color is green! FROG Algae Blocker 4Pro Drop ’n Go Pool Protection™ removes algae and prevents future outbreaks for up to 6 months. Each prefilled Drop ‘n Go pool pod fits any pool above or in ground, improves filter efficiency, eliminates the need for weekly dosing, and makes your job easier! Transform your pool service with tried, trusted and true, professional-grade pods.

Become a FROG Pro

Voted “Most Innovative Product for Service Professionals*”

Learn More


Drop ‘n Go prefilled pods in the
skimmer basket to prevent & cure algae make your job easy


No measuring, no spilling, no leaking
and no over/under dosing


25% more stain inhibitors to protect
all your pool surfaces from staining

Get 25% off any FROG 4Pro Buckets*

Learn More Now!

See How IT can

Save You Time. Boost Your Profits. Make Your Job Easier

Play

Algae Protection Made Simple

How do I use FROG Algae Blocker 4Pro?

Learn How – Click Here

The Alternative Way to Prevent and Kill Algae

Prevent & Kill Algae – Easier. Faster. More Effectively.
Only For Pros.

FROG Algae Blocker 4Pro pods contain a dry, concentrated formula that dispenses within hours.

Simply drop the pod into the skimmer basket and walk away! Each pod:

  • Prevents all types of algae — kills green and yellow algae
  • Protects pools with 25% more stain inhibitors than other algaecides
  • Dispenses within hours
  • Is safe to use on all pool types
  • Improves filter efficiency
  • Is 7x lighter than a quart of liquid chemicals

EPA registered algaecide prevents algae. Or cures it.

No Mess, No Guess, No Stress™.

Pool technician kneeling at pool edge, preparing Algae Blocker treatment.

Less Work, in Less Time with More Profits:

  • Drop ‘n Go prefilled pods in the skimmer basket remove and prevent all types of algae
  • No measuring, no spilling, no leaking and no under- or overdosing
  • 1 pod per 10,000 gallons prevents outbreaks for up to 6 months
  • Save money and time
  • Prevent customer call backs
  • Voted “Most Innovative Product for Service Professionals” *

*2024 International Pool Spa Patio Expo

Green-Proof Every Pool.

Prevent & Kill Algae — Easier. Faster. More Effectively. Only for Pros.

Made by the Pros for the Pros™:

  • Gives you and your customers peace of mind
  • NOT sold on Amazon
  • Light weight and easy to transport
  • Eliminates weekly dosing
  • Buckets come in 2 sizes which include either 18 or 50 pre-filled pods
  • Pairs perfectly with FROG Phosphate Remover 4Pro™ and FROG Clarifier 4Pro™
White bucket of FROG Algae Blocker 4PRO with a 2024 Innovation Award badge.

How do I use FROG Algae Blocker 4Pro?

3 simple steps. 0 extra work.

No measuring. No mixing. No callbacks.

  • Step 1: Drop the pod into the skimmer basket
  • Step 2: Leave it
  • Step 3: Discard the empty pod on your next visit

That’s it!

Learn More – Click Here

Save Time. Boost Profits. Make Your Job Easier

Provides Complete 4Pros Pool Care. Efficiency comes in threes.

Get 25% off any FROG 4Pro Buckets*

Learn More Now!

frequently asked questions

Find answers to common questions.

Typically, in a few hours — no more than 24. The empty pod will float to the top of the skimmer where it can be easily removed and discarded on you next service call.

When using FROG Algae Blocker 4Pro to remove algae from the water, use 1 pod for every 10,000 gallons of water and increase the free chlorine level to between 3ppm and 5ppm with a pH level between 7.2 and 7.8. After 24 hours, clean or backwash the filter to get rid of the dead algae.

When you use FROG Algae Blocker 4Pro as a preventative application, start with a clean filter and make sure sanitizer levels are in the correct range. Drop 1 pod for every 10,000 gallons of water in the skimmer every 6 months. Do not clean or backwash the filter for at least 2 weeks after using the pod.

Make sure the bucket is sealed and always store in a cool, dry, well-ventilated area until ready to use. It’s important to keep the desiccants in the bucket, do not discard them.

FROG Algae Blocker 4Pro has 4X Stain Guard™ — 4 distinct stain inhibitors that keep copper from falling out of the solution and staining surfaces.

Yes! As long as you backwash the filter first, then put all 3 in the skimmer at the same time. Do not backwash or clean filters for 2 weeks after using any of the pool pod products.

Competitive products often feature the same formula, but less of the chemicals needed to maintain an algae-free pool for up to 6 months, and therefore require more applications. Competitive products also take up much more space as they remain in the pump or skimmer basket for 6 months while FROG Algae Blocker 4Pro dispenses within hours.

Click here for full directions on using FROG Algae Blocker 4Pro.

  • Success doesn’t just happen. It’s a direct result of King Technology’s 45+ years of putting science and technology to work, to simplify the complicated, ultimately making everyone’s lives easier and keeping customers happy.

    Customer Profile Image

    Brett Libby

    Principal Scientist, King Technology

*One Time Purchase. Limit 4 buckets of each product. **You will be contacted prior to shipping for payment and your tax-exempt form.              

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*Compared to the minimum EPA recommended chlorine level of 1.0 ppm for a stabilized swimming pool. ∞For pools, hot tubs and swim spas.

*2024 International Pool Spa Patio Expo