CLOROX Pool&Spa Active99 3 Inch Chlorinating Tablets, 35 Lb Review
A 35 pound pail of CLOROX Pool&Spa Active99 3 inch chlorinating tablets, built with 99 percent Trichlor and a built-in stabilizer for longer-lasting sanitation.
| Brand | CLOROX Pool&Spa |
|---|---|
| Tablet size | 3 inch |
| Pack weight | 35 pounds |
| Active ingredient | 99% Trichlor |
| Color | White |
| Dimensions | 16.32 x 13.5 x 9.38 inches |
| Best for | Pool owners wanting a season-size supply of individually wrapped, stabilized 3 inch chlorine tablets |
Product Overview
Clorox builds this as an all-in-one 3 inch tablet rather than requiring separate algae and bacteria products, aimed at pool owners wanting one product to handle routine sanitation. Each tablet is individually wrapped, and the 35 pound size is meant for ongoing use across a season rather than a single top-up.
The tablet is built around 99 percent Trichlor, the active sanitizing ingredient, positioned by Clorox as killing bacteria while also preventing the growth of unsightly pool algae.
Score Breakdown
This verdict is based on the manufacturer's stated specifications, the current Amazon listing and its product images, the confirmed materials and design, real buyer ratings, and our research into the product category. Scores are consistent editorial judgments, not laboratory measurements, and we did not receive a paid sample.
Key Features
Kills bacteria with a high-concentration sanitizer.
Prevents unsightly pool algae growth.
Extends the working life of the chlorine.
Simplifies handling and dosing.
Flexible dispersal options.
Personalized dosage and troubleshooting guidance.
Design and Build Quality
The tablets ship in a pail measuring about 16.32 by 13.5 by 9.38 inches and weighing 35 pounds, finished in white. Clorox states the tablets are suitable for use in skimmers, feeders or floaters, giving flexibility in how the chlorine is dispersed into the pool.
A chlorine stabilizer is built into the tablet formula itself, which Clorox states extends the working life of the chlorine rather than letting it break down quickly from sun exposure.
Performance in Everyday Use
Sanitizing performance centers on the 99 percent Trichlor concentration, a specific figure that gives a checkable comparison point against other chlorinating tablets on the market rather than a vague strength claim.
For dosing guidance, Clorox points to its companion Clorox Pool App, which the brand states offers personalized product and dosage recommendations and can help troubleshoot common pool problems, extending support beyond the tablet itself.
How It Performs: The Evidence
| Decision factor | What we found | Evidence and measurement | Score | Why it matters |
|---|---|---|---|---|
| Trichlor concentration | 99 percent Trichlor | Feature bullet states these 3-inch chlorine tablets kill bacteria with 99% Trichlor | 8.4 | A specific concentration figure gives a checkable comparison against other tablets |
| Algae control | Prevents pool algae growth | Feature bullet states the product effectively prevents unsightly pool algae | 8.2 | Confirms the dual bacteria-and-algae claim for this tablet |
| Stabilizer content | Built-in chlorine stabilizer | Feature bullet states the tablet contains chlorine stabilizer to extend the life of your clean | 8.3 | Confirms the named ingredient behind the longer-lasting claim |
| Dispersal compatibility | Skimmers, feeders or floaters | Feature bullet states the tablets are suitable for use in skimmers, feeders, or floaters | 8.0 | Confirms the flexible dosing methods this tablet supports |
| Pack weight | 35 pounds | Title and size field both state 35LB / 35-Pound | 7.9 | Confirms the total pack weight purchased |
| App support | Clorox Pool App dosage guidance | Feature bullet states the Clorox Pool App offers personalized product and dosage recommendations | 7.8 | Confirms the companion app support named in the listing |
| Dimensions | 16.32 x 13.5 x 9.38 inches | Item dimensions list height 16.32 inches, width 13.5 inches, length 9.38 inches | 7.6 | Confirms the pail's physical footprint for storage planning |
Who Should Buy It
- Pool owners needing a full-season chlorine supply
- Buyers wanting one all-in-one bacteria and algae control tablet
- Flexible dosing through skimmers, feeders or floaters
- Buyers wanting app-based dosage guidance
- Households managing their own pool maintenance
- Buyers prioritizing a stabilized, longer-lasting tablet
- Spa or small pool owners who only need a handful of tablets rather than a full 35 pound pail
- At 35 pounds, this is a bulk size, not suited to buyers needing just a few tablets
- Only the white, standard tablet format is covered by this specific listing
- Chlorine tablets require careful handling and storage away from other pool chemicals
- No stated tablet count per pail, only the total weight figure
Full Specifications
How It Compares
| Feature | CLOROX Pool&Spa | Typical option | Higher-tier option |
|---|---|---|---|
| Trichlor concentration | 99 percent Trichlor | Lower concentration tablets | Similar high concentration |
| Pack size | 35 pound pail | Small top-up pack | Larger bulk pack |
| Stabilizer | Built-in stabilizer | No stated stabilizer | Built-in stabilizer, different formula |
| Wrapping | Individually wrapped tablets | Loose, unwrapped tablets | Individually wrapped, different size |
| Dispersal | Skimmer, feeder or floater compatible | Floater use only | Feeder use only |
| App support | Clorox Pool App guidance | No app support | Third-party app guidance |
Alternatives Worth a Look
This is a 35 pound pail of CLOROX Pool&Spa Active99 3 inch chlorinating tablets, built with 99 percent Trichlor and a stabilizer, compatible with skimmers, feeders and floaters, plus app-based dosage guidance. It suits pool owners needing a season-size chlorine supply, with the main consideration being that 35 pounds is a bulk commitment rather than a small top-up pack.
Frequently Asked Questions
What is the active sanitizing ingredient?
99 percent Trichlor, per the listing.
How much does this pail weigh?
35 pounds, per the listing.
Does this tablet control algae?
Yes, the listing states it effectively prevents pool algae.
Does this tablet include a stabilizer?
Yes, the listing states a built-in chlorine stabilizer to extend its working life.
Where can these tablets be used?
The listing states skimmers, feeders or floaters.
Is there an app for dosage guidance?
Yes, the listing names the Clorox Pool App for personalized recommendations.
What size are the individual tablets?
3 inches each, per the listing.
This review is based on Clorox's stated Trichlor concentration, stabilizer content, pack size and compatible dispersal methods for this product as listed. It is editorial analysis of the features as described, not independent water-chemistry testing of this specific product.