Buy 3 Get 1 Free Pool Chemicals | Mr Pool Man
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On Every Chemical, Every Order, No Codes
★★★★★ Trusted by 400,000+ Aussie Pool Owners

Buy 3 Chemicals.
Get the 4th Free.

The cheapest pool to own is the one you look after. Stock up on what your pool actually needs and we'll add the 4th one free. Simple as that.

Shop Chemicals How It Works
Australian Made
Same-Day Dispatch
Free Shipping Over $149
30-Day Money Back
Australia Post Award 2026
Free Shipping over $149 Same-Day Dispatch 30-Day Money Back 4.9★, 15,000+ reviews Aussie-Owned since 1998 About $1.40 a day Australia Post Small Business Innovation Award 2026
Skip the Pool Shop Run

Pay for 3. Get the 4th free.

Pick any pool chemical. Add 3 of the same to your cart. We add the 4th free at checkout. No codes needed. That's like 25% off every chemical in your order, or about $1.40 a day to look after your pool.

🧺 Pay +
🧺 Pay +
🧺 Pay =
🧺 Free
Example: 3 x Algaecide @ $39.99 = $119.97
4th Algaecide added free. You get 4L for the price of 3. Just $29.99 per litre.

Rule: B3G1F applies to 3 of the same product. Mix and match doesn't qualify. But you can add multiple sets in one order. Buy 3 Algaecide + 3 Chlorine = 1 free Algaecide + 1 free Chlorine.

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Featured Problem Solvers

Two chemicals that actually fix the problem.

Both B3G1F. Both under 24 hours to see results. Add 3 of either (or both) and stock up.

💥
Recommended follow-up

Oxi Shock 500g, the perfect finisher

After Stain Remover or Black Spot Remover does the heavy lifting, Oxi Shock clears the mess, softens the water, and gets your pool swim-ready in 15 minutes. Same B3G1F offer applies.

$24.99 $29.99
Add Oxi Shock
Australia Post, Small Business Innovation Award 2026

Every order ships with a free 12-pack of test strips.

Scan the QR code on the pack to open our award-winning free water tester on your phone. It reads your strip, tells you exactly what your pool needs, and lets you add the right chemicals to cart in seconds.

  • Free 12-pack of Water TechniX 7-in-1 test strips (worth $19.99)
  • Free online water tester, award-winning by Australia Post
  • No login, no email, 30 seconds poolside to answer
Try the Free Water Tester
Free 12-pack of test strips and award-winning water tester by Mr Pool Man
Complete Chemicals Range

Everything Your Pool Needs

Fighting a specific problem? See our problem-solver pages: Stain Remover · Black Spot Algae · All Chemicals

What Our Customers Say

400,000+ Aussie Pool Owners Trust Us

★★★★★

"Stocked up on chlorine when I saw the deal. Saved me a trip to the pool shop and the price was way better. Will be ordering again when I run low."

Jason R.
Bendigo VIC
Verified Buyer
★★★★★

"The phosphate remover is a game changer. My pool hasn't had algae since I started using it. Grabbed a stack of it and I'm set for the season."

Sarah M.
Perth WA
Verified Buyer
★★★★★

"Finally found a stain remover that actually works on rust stains from bore water. Arrived in 2 days. Proper Australian quality."

Dave T.
Toowoomba QLD
Verified Buyer

Frequently Asked Questions

How does Buy 3 Get 1 Free work?

Pick any chemical. Add 3 of the same one to your cart. We automatically add the 4th free with no code needed. Every chemical on this page qualifies, and you can use it multiple times. Buy 3 Algaecide, get 1 free. Buy 3 Chlorine, get 1 free. Stock up on everything.

Can I mix different chemicals in the offer?

The Buy 3 Get 1 Free applies to 3 of the same product only. So you'd buy 3 Algaecide to get a 4th Algaecide free, or 3 Phosphate Remover to get a 4th free. Mix and match doesn't qualify. But you can place multiple sets in one order. 3 Chlorine + 3 Algaecide = 1 free Chlorine + 1 free Algaecide.

I don't know what chemicals my pool needs. Help?

Use our free water tester. It reads a test strip from your phone and tells you exactly what to add. Or, if you're new to pool ownership, our New Pool Owner Guide walks you through everything step by step with product recommendations for your specific pool type.

What if I order the wrong chemical?

30-day return policy on unopened products. If you're unsure before ordering, email our support team and we'll help you figure out exactly what you need.

Is shipping really free over $149?

Yes. All orders over $149 ship free Australia-wide. Most metro orders arrive in 1 to 3 business days. Orders before 2pm AEST ship same day.

Stock Up & Save

Buy 3 Chemicals.
Get the 4th Free.

No codes. No limits. Every chemical, every order. Free shipping over $149, and this deal usually clears it.

★★★★★ 15,000+ Reviews
30-Day Money Back
Free Shipping Over $149
Shop All Pool Chemicals

Buy 3 of the same chemical, 4th added free at cart. No code needed.