The tub is warm, the cover is off, and the water needs its regular care. The dichlor vs trichlor hot tub question comes down to form and pace: dichlor comes as granules that dissolve quickly, while trichlor comes as tablets; the AX tablets dissolve slowly over 3 to 5 days. This comparison covers form, dissolve speed, chlorine content and upkeep, with two examples of each side from the listings.
Listings were collected 5 November 2026. Dichlor and trichlor are both chlorine sanitizers, and the listings below describe their own form, content and routine.
This article is informational and is not medical advice. Hot tub chemicals are strong oxidizers: store them dry and apart from each other, keep them away from children, and follow the directions on the label. See our Medical Disclaimer.
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Quick picks
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1
AquaFinesse Hot Tub Water Care Kit -Trichlor Chill Score 9.6/10Check price on AmazonA hot tub water care kit with Tri-Chlor mini tabs, two 2 liter bottles of solution, a measuring cup and a manual, covering 3 to 5 months of spa maintenance.
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2
1" Chlorine Tablets 1.5 lbs Chill Score 9.6/10Check price on Amazon1-inch trichlor tablets, 20g each, with 90% available chlorine and 99% trichlor, dissolving slowly over 3 to 5 days for hot tubs, spas and small pools.
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3
SpaChoice 5-Pounds Premium Spa Sanitizing Chlorine Chill Score 9.6/10Check price on AmazonPremium spa sanitizing chlorine granules, 5 pounds, with 99% sodium dichlor and stated dose figures for 500 gallons of water.
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4
AquaDoc Hot Tub Chlorine Granules Chill Score 9.5/10Check price on AmazonQuick dissolving dichlor granules, 10 lb, for hot tubs and spas, made in the USA, with a steady source of available chlorine for routine care.
A hot tub water care kit with Tri-Chlor mini tabs, two 2 liter bottles of solution, a measuring cup and a manual, covering 3 to 5 months of spa maintenance.
Pros & ConsViewHide
Pros
- Covers 3 to 5 months of spa maintenance in one kit
- Includes two 2 liter bottles of solution, a measuring cup and a manual
- Weekly routine of one minute, one time per week
- Tri-Chlor mini tabs included
Cons
- No chlorine percentage is stated in the listing
- No warranty term is stated
- The kit weighs 11.0 pounds, the heaviest pick here
- No tablet count is stated for the mini tabs
1-inch trichlor tablets, 20g each, with 90% available chlorine and 99% trichlor, dissolving slowly over 3 to 5 days for hot tubs, spas and small pools.
Pros & ConsViewHide
Pros
- 90% available chlorine and 99% trichlor stated
- Each 20g tablet dissolves slowly over 3 to 5 days
- UV stabilized against sunlight
- About 34 tablets in a 1.5 lb bottle
Cons
- The tablet count is approximate: about 34 tablets in the bottle
- No warranty term is stated
- The listing states no dose in teaspoons
- Suits 500 to 3,000 gallon water bodies only
Premium spa sanitizing chlorine granules, 5 pounds, with 99% sodium dichlor and stated dose figures for 500 gallons of water.
Pros & ConsViewHide
Pros
- 99% sodium dichlor stated
- Stated dose figures: 6 teaspoons per 500 gallons to start, 3 teaspoons as needed
- Each teaspoon provides about 1.4 ppm available chlorine in 500 gallons
- Dissolves quickly and completely
Cons
- No warranty term is stated
- Two dose figures are stated, 3 teaspoons as needed and 6 teaspoons for the initial dose, so read the label for which applies
- Granules need measuring by the teaspoon at each dose
- No shelf life or storage figure is stated
Quick dissolving dichlor granules, 10 lb, for hot tubs and spas, made in the USA, with a steady source of available chlorine for routine care.
Pros & ConsViewHide
Pros
- 10 lb container, the largest granule supply here
- Dissolves quickly to sanitize spa and hot tub water
- Easy to measure and apply while water is circulating
- Made in the USA
Cons
- No chlorine percentage is stated in the listing
- No dose figure in teaspoons or ppm is stated
- No warranty term is stated
- The listing states no tub size or gallon range
Dichlor vs trichlor hot tub at a glance
| Dichlor | Trichlor | |
|---|---|---|
| Form | Granules | Tablets, plus a kit with tabs |
| Dissolve speed | Dissolves quickly | AX: slowly, over 3 to 5 days per tablet; Aqua Finesse mini tabs: not stated |
| Chlorine content (stated) | SpaChoice: 99% sodium dichlor; AquaDoc: not stated | AX: 99% trichlor, 90% available chlorine; Aqua Finesse: not stated |
| Pack size (stated) | 10 lb and 5 lb | 1.5 lb, about 34 tabs; kit for 3 to 5 months |
| Tub size (stated) | SpaChoice: doses per 500 gallons; AquaDoc: not stated | AX: 500 to 3,000 gallons; Aqua Finesse: not stated |
| Routine | Regular care; SpaChoice doses by the teaspoon | Weekly; Aqua Finesse: one minute, one time per week |
Form and dissolve speed
Both dichlor listings are granules. The AquaDoc granules dissolve quickly to sanitize spa and hot tub water, and the SpaChoice granules dissolve quickly and completely. The SpaChoice granules are measured by the teaspoon. The AquaDoc listing says to add the granules while the water is circulating.
Both trichlor listings are tablets. Each AX tablet weighs 20g and dissolves slowly and steadily over 3 to 5 days, holding a 1 to 3 ppm free chlorine residual. The Aqua Finesse kit includes Tri-Chlor mini tabs with two 2 liter bottles of solution, a measuring cup and a manual, and asks for one minute, one time per week.
Chlorine content and dosing
The SpaChoice listing states 99% sodium dichlor, with an initial dose of 6 teaspoons for each 500 gallons of water, then 3 teaspoons per 500 gallons as needed. Each level teaspoon, 0.17 ounce, provides about 1.4 ppm available chlorine in 500 gallons of water.
The AX listing states 90% available chlorine and 99% trichlor, in 1-inch tablets of 20g each, with about 34 tablets in a 1.5 lb bottle. The Aqua Finesse kit does not state a chlorine percentage, so its strength cannot be compared on that figure.
Upkeep and routine
Dichlor upkeep is measured by the dose: the SpaChoice listing counts teaspoons per 500 gallons, and the AquaDoc listing describes routine care. The AquaDoc listing describes a 10 lb container for ongoing spa maintenance, with a steady source of available chlorine when used as directed. The SpaChoice listing gives the dose figures above and describes routine care.
Trichlor upkeep is paced by the tablets and the kit. The AX tablets last up to 5 days each, and the bottle holds about 34 tablets for weekly routine pool water care. The Aqua Finesse kit covers 3 to 5 months of spa maintenance in one box, with a weekly routine of one minute.
Gear for each side
These are scored on the Chill Score: performance, build, value, safety and warranty. None of the listings states a safety certification or a warranty term, so all four score zero for safety and warranty.
| Product | Chill Score | Perf. /35 | Build /25 | Value /25 | Safety /10 | Warranty /5 |
|---|---|---|---|---|---|---|
| AquaFinesse Care Kit | 9.6 | 30 | 21 | 21 | n/a | 0 |
| AX 1 in Chlorine Tabs | 9.6 | 29 | 20 | 20 | n/a | 0 |
| SpaChoice Dichlor 5 lb | 9.6 | 28 | 20 | 20 | n/a | 0 |
| AquaDoc Dichlor 10 lb | 9.5 | 28 | 19 | 19 | n/a | 0 |
Scores run from 9.2 to 9.8: each product’s point total is placed on that range, so more points always means a higher score. Safety counts only for powered gear or where the listing states safety features; where it does not apply, the score is taken over the remaining 90 points.
Choose dichlor if
- You want granules that dissolve quickly, with the dose counted in teaspoons, as the SpaChoice listing gives it.
- You want dose figures stated on the listing, as the SpaChoice listing gives them.
- You want a large supply in one container, like the 10 lb AquaDoc tub.
- Your routine already includes regular water checks.
Choose trichlor if
- You want tablets that dissolve slowly, with the AX listing stating 3 to 5 days per tablet.
- You want a kit that covers 3 to 5 months of spa maintenance in one box.
- You want a weekly routine of one minute, as the Aqua Finesse kit states it.
- Your tub or pool holds 500 to 3,000 gallons, the range the AX listing states.
Check Your Space First
- Measure the storage shelf: the Aqua Finesse kit measures 12.0 x 8.0 x 14.0 inches and weighs 11.0 pounds, the largest and heaviest pick here.
- Keep granules and tablets dry and apart: the AquaDoc granules come in a 10 lb container, and the AX tablets come in a moisture-resistant bottle.
- Check the tub size against the tablet listing: the AX tablets are sized for 500 to 3,000 gallon water bodies.
- Leave room for the kit extras: the Aqua Finesse kit includes two 2 liter bottles, a measuring cup, Tri-Chlor mini tabs and a manual.
Common questions
Can I use trichlor tablets in a hot tub?
The listings here say yes for their own products: the AX tablets are listed for hot tubs and spas, and the Aqua Finesse kit is a hot tub water care kit with Tri-Chlor mini tabs. Follow the directions on the label of the product you buy.
How often do I add dichlor granules?
The SpaChoice listing states an initial dose of 6 teaspoons for each 500 gallons of water, then 3 teaspoons per 500 gallons as needed. The AquaDoc listing describes routine use with regular water checks. Follow the label of the product you buy.
How long does a trichlor tablet last?
The AX listing states each 20g tablet dissolves slowly over 3 to 5 days, and lasts up to 5 days, holding a 1 to 3 ppm free chlorine residual. The Aqua Finesse kit does not state how long its mini tabs last; it covers 3 to 5 months of spa maintenance with a weekly routine of one minute.
Can I mix dichlor and trichlor?
None of the listings here states that the two can be mixed. Each product lists its own directions, so follow the label of the product you buy and store the products apart.
What size tub do the AX tablets suit?
The AX listing sizes its tablets for 500 to 3,000 gallon water bodies, including inflatable pools, above-ground pools and spas. Check the listing for the fit of your own tub.
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