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The best chlorine dosing floats for 2026

A dosing float is a vented plastic ball holding a chlorine or bromine tablet, and it does two jobs that are easy to underestimate. It meters — the vents set how much water reaches the tablet, which sets the dissolution rate — and it keeps the tablet off the liner, which is the difference between a chlorinated pool and a bleached patch of vinyl. The first specification is the tablet capacity and size, and it is a compatibility question: a floater built for 20 g tablets will not take a 200 g puck, and a floater built for 200 g pucks meters a 20 g tablet far too fast. The second is the vent adjustment, which is the entire control the device offers; a fixed-vent floater cannot be turned down for a cool week or a small bather load. Then the material, because this object lives in the most aggressive water in the pool — its inside is in contact with an undissolved tablet — and the ones that survive several seasons say what they are made of. Weighted or tethered designs matter more than they look: an untethered floater drifts into the skimmer, where it doses the filter rather than the pool, and a floater that ends up stuck against a wall bleaches a stripe. And spa suitability, which is a separate question because spa floaters are smaller, slower and generally meant to be removed while bathing. We compare tablet size and capacity, vent adjustment, materials, tether or weight and spa versions.

These parts, one figure beside another

  1. Bestway floating chemical dispenser 12.5 centimetres across with an adjustable vent ring

    Bestway Dosierschwimmer Ø 12,5 cm

    A 12.5 cm float taking tablets up to Ø 2.5 cm with an adjustable dosing aperture — the smallest tablet ceiling published on this shelf.

    Tablet size
    Tablets up to Ø 2.5 cm — the smallest ceiling in this family. The 20 g chlorine tablets in this catalogue are published at about Ø 3 cm
    Capacity
    Not published as a weight. Float diameter Ø 12.5 cm
    Vent adjustment
    Adjustable dosing aperture, stated
    Materials
    Not published
    Tether or weight
    Not published — as with all seven floats in this family
    Spa version
    Not published
    Amazon reference
    B0CDXMDW7C (one reference across 6 Amazon marketplaces)
    EAN
    6941607347416
    • Publishes a tablet diameter rather than only a weight, which is what actually has to fit
    • An adjustable aperture, which six of the seven floats here have
    • Ø 2.5 cm excludes the 20 g tablets published in this catalogue at about Ø 3 cm

    Best for: Small tablets of 2.5 cm or less, in a Bestway pool

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  2. Blue and white wojonifuiliy floating chlorine dispenser with an adjustable base ring

    wojonifuiliy Dosierschwimmer 20 g

    A 20 g float in chemical-resistant PVC with an adjustable ring at the base, stated for chlorine or bromine tablets and for a pool, a spa or a garden fountain.

    Tablet size
    Not published as a diameter. Capacity 20 g of chlorine or bromine tablets
    Capacity
    Up to 20 grams
    Vent adjustment
    Adjustable ring at the base controlling the release rate, stated to be matched to water volume, water temperature and current water quality
    Materials
    PVC, blue and white, stated chemical-resistant and to withstand ageing, cracking and fading under permanent sun and water exposure, with a smooth surface resisting scale and algae
    Tether or weight
    Not published — as with all seven floats in this family
    Spa version
    Not published as a separate version. Stated for pools, hot tubs, spas, water parks, fish ponds and garden fountains
    Amazon reference
    B0GY3WCTX6 (one reference across 5 Amazon marketplaces)
    EAN
    0762809742993
    • The most detailed material statement here — PVC, named, with four specific resistances
    • States what the ring should be set against: volume, temperature and current water quality
    • No tablet diameter, so fit against a 3 cm tablet cannot be checked

    Best for: A small pool or spa dosed with 20 g tablets, where the release rate is adjusted through the season

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  3. Brown Intex floating chlorine dispenser for PureSpa inflatable hot tubs

    Intex Chlorspender 29044

    A floating dispenser for Intex inflatable spas and PureSpas up to 1 098 litres, taking a single 3.8 cm chlorine tablet — the largest published tablet diameter on this shelf.

    Tablet size
    One tablet of 3.8 cm — the largest tablet diameter published in this family
    Capacity
    One tablet
    Vent adjustment
    Not published — the only float in this family without an adjustable ring
    Materials
    Plastic, brown. No polymer named
    Tether or weight
    Not published — as with all seven floats in this family
    Spa version
    Yes — stated for Intex inflatable hot tubs and PureSpas up to 1 098 litres. The only float here sized to a stated water volume
    Amazon reference
    B07KWRGJZY (one reference across 6 Amazon marketplaces)
    EAN
    6941057413983
    • The only float here matched to a published water volume — up to 1 098 litres
    • Publishes the tablet diameter it takes, which five rivals do not
    • No adjustable aperture — the only float in this family without one

    Best for: An Intex PureSpa or inflatable hot tub under 1 098 litres

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  4. FUDUOXIAO seven inch floating chlorine dispenser in polypropylene with an extendable body

    FUDUOXIAO Dosierschwimmer 7 Inch

    A seven-inch float in PP with an adjustable base ring and an extendable body that collapses for storage — the only telescoping dispenser on this shelf.

    Tablet size
    Not published
    Capacity
    Not published as a weight. Float diameter 7 inch — about 17.8 cm, the largest in this family
    Vent adjustment
    Adjustable ring at the base for precise control of the dosing quantity, stated
    Materials
    PP, stated light, with high buoyancy, safe, environmentally friendly and durable, with a smooth surface resisting dirt build-up and no ageing or cracking after long immersion
    Tether or weight
    Not published — as with all seven floats in this family
    Spa version
    Not published as a separate version. Stated for pools, water parks, wellness centres, aquariums, fish ponds and garden fountains
    Amazon reference
    B0GZNR2BLS (one reference across 5 Amazon marketplaces)
    EAN
    0760314812736
    • The only float here that collapses for storage and transport
    • The largest float body on this shelf at seven inches
    • Publishes neither a tablet size nor a capacity in grams

    Best for: A larger pool where the dispenser is put away between seasons

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  5. HAF floating chemical dispenser for 20 gram chlorine and bromine tablets

    HAF Dosierschwimmer 20 g

    A 20 g float for chlorine or bromine tablets with a regulated dosing aperture, stated to distribute evenly without direct tablet contact with the pool.

    Tablet size
    Not published as a diameter. Suitable for 20 g chlorine tablets, stated
    Capacity
    20 g
    Vent adjustment
    Regulated dosing aperture allowing individual setting, so the chlorine supply can be matched to pool size, use and temperature, stated
    Materials
    Not published as a polymer. Stated robust and resistant to pool chemistry, UV radiation and water
    Tether or weight
    Not published — as with all seven floats in this family
    Spa version
    Not published as a separate version. Stated for above-ground and garden pools, swimming pools and hot tubs
    Amazon reference
    B0D1NDYBKJ (one reference across 1 Amazon marketplace)
    EAN
    4262465963696
    • Names three things the aperture should be matched to: pool size, use and temperature
    • States the point of a float plainly — no direct contact between tablet and pool
    • No tablet diameter published, only a weight

    Best for: An above-ground pool dosed with 20 g tablets, chlorine or bromine

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  6. Gre floating chemical dispenser with an integrated thermometer and adjustable lower ring

    Gre Dosierer 40070 with thermometer

    The widest tablet range on this shelf — 20 to 500 g — with a built-in thermometer and a product consumption indicator, so one object does three jobs.

    Tablet size
    Not published as a diameter. For tablets from 20 to 500 g — the widest range in this family
    Capacity
    Up to 500 g
    Vent adjustment
    Lower ring regulating the dissolution of the chemicals at higher or lower intensity, stated
    Materials
    Highly resistant thermoplastic, stated durable and resistant. No polymer named
    Tether or weight
    Not published — as with all seven floats in this family
    Spa version
    Not published. Includes an indicative thermometer containing alcohol and phenol red, and a product consumption indicator
    Amazon reference
    B00L2IG7AG (one reference across 6 Amazon marketplaces)
    EAN
    8427370400704
    • The widest tablet range on this shelf — 20 g to 500 g covers both tablet sizes in this catalogue
    • A built-in thermometer, so one fewer object floats in the pool
    • No tablet diameter, only a weight range

    Best for: A pool using 200 g tablets, where the water temperature is worth watching

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  7. Monzana large floating chemical dispenser with an adjustment ring, supplied with test strips

    Monzana Dosierschwimmer 20–200 g set

    A large float taking both 20 g and 200 g tablets — chlorine, salt, oxygen or bromine — supplied with 150 three-in-one test strips and a thermometer.

    Tablet size
    Not published as a diameter. For 20 g and 200 g tablets — chlorine, salt, oxygen or bromine
    Capacity
    20 g to 200 g
    Vent adjustment
    Adjustment ring for individual and even release of the pool chemistry, stated
    Materials
    Robust UV-resistant PVC, stated durable, colour-stable and gentle on the pool liner, with an edge-free surface
    Tether or weight
    Not published — as with all seven floats in this family
    Spa version
    Not published as a separate version. Stated for paddling pools, hot tubs, above-ground and frame pools and swimming ponds. Supplied with 150 3-in-1 test strips and a thermometer
    Amazon reference
    B0H2N4MLK9 (one reference across 5 Amazon marketplaces)
    EAN
    4251776937502
    • Takes both tablet sizes sold in this catalogue, and names four chemistries
    • States that the extra-large opening does not open by itself, which no other listing addresses
    • No tablet diameter published

    Best for: A frame pool or swimming pond where both tablet sizes might be used and the water is tested weekly

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This category at a glance

  • Highest Amazon reference in this category: Intex Schwimmender Chlorspender 29044 (B07KWRGJZY (one reference across 6 Amazon marketplaces)).
  • Highest Capacity in this category: Gre Schwimmender Dosierer 40070 (Up to 500 g).

Every model compared

Only the specifications at least four models out of five state. A column that is more empty than full compares nothing.

ModelPriceAmazon referenceCapacityMaterialsSpa version

Guides covering this category

Sources and method

Specifications: manufacturer sheets and Amazon product pages. Prices and availability: Keepa. No product on this site has been physically tested.

Most recent revision in this category: September 21, 2026.

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