Trichlor Tablets 20kg | 100 x 200g | Slow-Release Pool Chlorine
The ultimate bulk pool chlorine for large pools, commercial use, or stocking up for the full season. Trichlor Tablets 20kg gives you 100 x 200g slow-dissolving tablets - consistent, hands-off pool sanitisation at the lowest cost per tablet in the range. Each tablet combines chlorine, algicide, and clarifier in a single slow-release formula that keeps your pool crystal clear with minimal effort.
Drop a tablet in your skimmer or floating dispenser and let it work - no daily dosing, no measuring, no fuss. At this pack size, you're covered for the entire NZ pool season and beyond.
Product Specifications
| Pack Size | 20kg (100 x 200g tablets) |
| Tablet Weight | 200g each |
| Formula | 3-in-1 slow-dissolving (chlorine, algicide, clarifier) |
| UV Stabilised | Yes - built-in cyanuric acid stabiliser |
| Suitable For | Swimming pools only (not suitable for spa pools) |
| Target Chlorine Level | 1-3 ppm |
| Dosing Rate | 1 tablet per 20,000L, replace every 1-2 weeks |
Key Features
- 3-in-1 Formula. Chlorine, algicide, and clarifier in every tablet.
- Slow-Dissolving. Each tablet lasts approximately 1-2 weeks, providing consistent chlorine release.
- UV-Stabilised. Built-in cyanuric acid stabiliser resists UV breakdown in NZ summer sun.
- Hands-Off Maintenance. Set and forget - ideal for busy pool owners.
- 20kg Bulk Bucket. Lowest cost per tablet in the range, ideal for large pools or commercial use.
Dosing Guide
- Use 1 tablet per 20,000L of pool water
- Replace every 1-2 weeks as the tablet dissolves
- Place in skimmer basket, in-line tablet dispenser, or floating dispenser
- Target chlorine level: 1-3 ppm for swimming pools
- Test weekly with test strips to confirm chlorine levels are maintained
Important: Never place tablets directly on pool surfaces - concentrated chlorine can bleach and damage vinyl liners, fibreglass, and concrete. Always use a skimmer basket, in-line dispenser, or floating dispenser.
pH Note: Trichlor is slightly acidic. Regular use will gradually lower your pool pH. Test weekly and use pH Increaser (Soda Ash) to maintain the ideal 7.2-7.6 range.
How Long Will a 20kg Bucket Last?
| Pool Size | Tablets per Fortnight | Duration |
| 20,000L | 1 tablet | ~200 weeks (3+ seasons) |
| 40,000L | 2 tablets | ~50 weeks (full NZ season) |
| 80,000L | 4 tablets | ~25 weeks (half season) |
Available Sizes
- 5-Pack (1kg) - ideal for trying Trichlor or small pools.
- 10-Pack (2kg) - great for smaller pools or seasonal use.
- 20-Pack (4kg) - most popular for regular pool owners.
- 50-Pack (10kg) - best value for large residential pools.
- 100-Pack 20kg (this product) - lowest cost per tablet, ideal for large pools, commercial use, or stocking up.
Trichlor vs Crystalline Chlorine
- Trichlor Tablets (this product). Slow-dissolving, set-and-forget baseline chlorination. Best for ongoing maintenance.
- Crystalline Chlorine (Dichlor). Fast-dissolving, ideal for shock dosing. Best for top-ups and reactive treatment.
- Best practice: Use both - Trichlor for ongoing baseline, Dichlor for shock dosing when needed.
Safety and Storage
- Store in a cool, dry place away from direct sunlight and moisture
- Keep away from children and pets
- Never mix with other pool chemicals - Trichlor reacts violently with calcium hypochlorite and other oxidisers
- Always wash hands after handling
- Do not place tablets directly in pool water - always use a dispenser
- Refer to the Safety Data Sheet (SDS) for full handling instructions
Recommended Accessories
- 5-in-1 Test Strips - test chlorine and pH weekly when using Trichlor.
- Crystalline Chlorine 4kg - shock dose alongside Trichlor for complete pool care.
- pH Increaser (Soda Ash) 4kg - counteract Trichlor acidity and keep pH balanced.
- Alkalinity Increaser 4kg - maintain Total Alkalinity for consistent results.
Frequently Asked Questions
Q: How long will a 20kg bucket last?
A: For a 40,000L pool using 2 tablets per fortnight, a 100-tablet bucket lasts approximately 50 weeks - a full NZ pool season. For a 20,000L pool using 1 tablet per fortnight, it lasts over 3 seasons.
Q: Can I use Trichlor tablets in a spa pool?
A: No - Trichlor tablets are not recommended for spa pools. The smaller water volume and higher temperatures cause cyanuric acid to build up rapidly, leading to over-stabilisation. Use Crystalline Chlorine (Dichlor) for spas instead.
Q: Why is my pH dropping after using Trichlor?
A: Trichlor is slightly acidic (pH approximately 2.8-3.5). Regular use will gradually lower your pool pH. Test weekly and use pH Increaser (Soda Ash) to maintain the ideal 7.2-7.6 range.
Q: Can I put tablets directly in the pool?
A: No - never place tablets directly on pool surfaces. The concentrated chlorine can bleach and damage vinyl liners, fibreglass, and concrete. Always use a skimmer basket, in-line dispenser, or floating dispenser.
Q: What is the difference between Trichlor and Dichlor?
A: Trichlor is slow-dissolving and ideal for ongoing baseline chlorination via a dispenser. Dichlor (Crystalline Chlorine) is fast-dissolving and ideal for shock dosing and spa use. Most pool owners benefit from using both.
Q: Is this suitable for commercial pools?
A: Yes - the 20kg bucket is our most popular size for commercial pools, holiday parks, and multi-pool operators. Contact us for volume pricing on larger orders.
Pickup and Delivery
Perfect Pools Service Warehouse - 15C Douglas Alexander Parade, Albany, Auckland
Hours: Mon-Fri 9am-4pm | Sat 10am-2pm
NZ-wide delivery available. Charges calculated at checkout.
Questions? Email perfectpoolsnz@gmail.com or visit our contact page.
