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Collection: Dosing & Auto Top Off

Auto top-off systems, dosing pumps, reservoirs, and auto water changers to keep salinity and reef chemistry stable automatically. An auto top-off holds salinity steadier between water changes than any manual routine.

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86 products

Red Sea ReefDose Head Assembly - R35345

Red Sea ReefDose Head Assembly

Regular price $49.95
Sale price $49.95 Regular price
Red Sea ReefDose Head Tube - R35344

Red Sea ReefDose Head Tube

Regular price $16.95
Sale price $16.95 Regular price
Red Sea ReefDose Measuring Cylinder

Red Sea ReefDose Measuring Cylinder

Regular price $21.99
Sale price $21.99 Regular price
Red Sea ReefDose Red/Yellow Tubes (4 x 3m)

Red Sea ReefDose Red/Yellow Tubes (4 x 3m)

Regular price $31.99
Sale price $31.99 Regular price
Red Sea ReefDose Tube Organizer Clip

Red Sea ReefDose Tube Organizer Clip

Regular price $31.99
Sale price $31.99 Regular price
Red Sea ATO Pumps & Accessories

Red Sea Slide Out Control Panel 25

Regular price $249.00
Sale price $249.00 Regular price
Red Sea Slide Out Control Panel 60

Red Sea Slide Out Control Panel 60

Regular price $299.99
Sale price $299.99 Regular price
Seaside Aquatics Dosing Container - 1.5 Litre

Seaside Aquatics Dosing Container - 1.5 Liter

Regular price $43.40
Sale price $43.40 Regular price
Seaside Aquatics Dosing Container - 2.5 Litre

Seaside Aquatics Dosing Container - 2.5 Liter

Regular price $56.00
Sale price $56.00 Regular price
Seaside Aquatics Dosing Container - 5.0 Liter

Seaside Aquatics Dosing Container - 5.0 Liter

Regular price $91.00
Sale price $91.00 Regular price
Tunze Check Valve - 5074.010

Tunze Check Valve - 5074.010

Regular price $11.30
Sale price $11.30 Regular price
Tunze Osmolator 3 ATO - 3154

Tunze Osmolator 3 ATO - 3154

Regular price $354.75
Sale price $354.75 Regular price
Tunze ATO Pumps & Accessories

Tunze Osmolator Magnetic Mount - 3155.600

Regular price $67.90
Sale price $67.90 Regular price
Tunze Osmolator Nano 3 ATO - 3151

Tunze Osmolator Nano 3 ATO - 3151

Regular price $212.75
Sale price $212.75 Regular price
Tunze Osmolator Nano Controller - 4017. Replacement controller for the Tunze Nano Osmolator.

Tunze Osmolator Nano Controller - 4017

Regular price $117.50
Sale price $117.50 Regular price
Tunze Osmolator Replacement Controller - 5017

Tunze Osmolator Replacement Controller - 5017

Regular price $241.15
Sale price $241.15 Regular price
Tunze RO Water Controller - 8555.000

Tunze RO Water Controller - 8555.000

Regular price $368.95
Sale price $368.95 Regular price
Tunze Turbelle High Jet Osmolator Replacement Pump - 5000.021

Tunze Turbelle High Jet Osmolator Replacement Pump - 5000.021

Regular price $120.45
Sale price $120.45 Regular price
Tunze Universal Osmolator Replacement Pump 5000.020

Tunze Universal Osmolator Replacement Pump 5000.020

Regular price $49.20
Sale price $49.20 Regular price
Tunze Universal Osmolator Replacement Tube - 5000.390

Tunze Universal Osmolator Replacement Tube - 5000.390

Regular price $12.35
Sale price $12.35 Regular price

Two Jobs, Both Automated

A reef tank loses fresh water to evaporation every day, which drives salinity up, and its corals steadily consume calcium, alkalinity, and magnesium. Auto top-off (ATO) handles the first by replacing evaporated water automatically; dosing pumps handle the second by delivering supplements on a set schedule. Together they take the two most tedious daily tasks off your hands. We carry gear from EcoTech, Bubble Magus, IceCap, Kamoer, and AutoAqua.

What You'll Find Here

  • ATO systems — sensor-controlled pumps that top off evaporated water and hold salinity steady.
  • Dosing pumps — single and multi-head peristaltic pumps for precise supplement dosing.
  • Reservoirs — top-off and dosing containers to feed both systems.
  • Auto water changers — automated systems that swap out old water for new.
  • Tubing & accessories — dosing tube, holders, and anti-siphon valves.

An ATO is the single best safeguard against a salinity swing while you're away. Pair a dosing pump with a good test routine so you're replacing exactly what your corals use. Email info@jlaquatics.com to match a system to your tank. J&L has equipped Canadian reefkeepers since 1997.

J&L Aquatics was formed in December 1997

Our business was started from our love of the aquarium hobby. We at J&L Aquatics felt that the Canadian aquarist should have the option to purchase top quality supplies, equipment and livestock other than the generally over priced local retail stores.