HTH 3″ Chlorine Tablets Only $124.99 (Reg. $149) at Costco

Updated August 28, 2026

HTH 3″ Chlorine Tablets for pool sanitization are on sale at Costco for $124.99 with free shipping. This deal gives you the essential chlorine for a large pool at a solid discount.

Why this pool chemicals deal stands out

• 40‑lb bulk package covers up to 5,000 gallons, perfect for medium‑large pools.
• HTH is a trusted brand known for consistent chlorine strength and fast dissolve.
• Free shipping eliminates extra costs, a rare perk for heavy items.
• Typical retail price hovers around $149, so the $124.99 price saves roughly 16%.

How to grab the deal at Costco

1. Confirm the price is $124.99 and that free shipping is applied.
2. Add the 40‑lb tub to your cart and proceed to checkout.
3. Tap the SHOP HERE button above to complete your purchase.

Savings tips & price context

Costco members often qualify for free shipping on bulk items, so you don’t need to meet a minimum spend. Compare this price to other retailers where the same 40‑lb package can exceed $150. Using your Costco membership already gives you an extra layer of savings. If you have a Costco Executive Membership, you earn 2% cash back on purchases, which adds another modest discount to the already reduced price.

FAQ

Is the free shipping truly free for the 40‑lb tub?

Yes, Costco lists free shipping on this item. Verify on the product page before checkout.

How many gallons of water does one 40‑lb bag cover?

A 40‑lb bag typically treats up to 5,000 gallons, depending on your pool’s chlorine demand.

Do I need a Costco membership to buy this?

Yes, Costco requires a membership for online purchases. If you’re not a member, you can sign up for a trial.

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