SpectraPure® LiterMeter 3

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This item has been discontinued.


The new LiterMeter III™ is an automatic precision dosing system for the aquarium and horticulture industry. Three independent programs control one built-in pump and up to two external pumps (sold separately). Perform 2-way water changes, in addition to eliminating the manual drudgery of dosing Kalkwasser, trace elements, or topping off evaporated water. Quiet operation, auto-calibration, and virtually maintenance-free.

Calcium maintenance and alkalinity control are essential for a healthy reef tank. SpectraPure®’s LiterMeter III™ eliminates the manual drudgery of dosing Kalkwasser, trace elements, or topping off evaporated water. Kalkwasser replenishment, to be most effective, should be added to your aquarium slowly and consistently to avoid precipitation of calcium carbonate. The LiterMeter III™ automatically and reliably performs this task for you.

The LiterMeter III™ offers features found only on expensive laboratory pumps. Built-in calibration features eliminate the guesswork of uncalibrated competitive units. Unlike noisy industrial metering pumps sold to the aquarium trades, SpectraPure®’s LiterMeter III™ was specially designed for critical aquarium dosing and is so quiet you can use it in your living room. Superior three-roller direct-motor drive eliminates noisy gears and improves flow accuracy and tubing life. It can be run dry without damage, and pumps either from a draw height of 12 feet or to a delivery height of 60 feet.

Three independent programs control the internal pump, as well as two optional external pumps. The LM3-RPM is a LiterMeter III™ pump mounted in a small plastic box. The LM3-TCM (SP1095) is an optional level sensor that interrupts power to the LiterMeter III™ when a high water level is detected. The LM3-WXM (SP1093) combines an LM3-RPM (SP1091) and an LM3-TCM (SP1095) in one package, interrupting power only to that pump. See the Operations Manual for application examples.

  • Quietest pump on the market; excellent for reef tanks
  • One internal pump provided with unit, remote pumps optional
  • Fully automatic pump operation - Set it and forget it
  • Precision calibration feature eliminates guesswork
  • Dependable and virtually maintenance free
  • Self-priming and Anti-siphoning
  • Compact size and cool operation
  • Uses less than 6 Watts of power when operating
  • 5 years warranty
  • Precision dosing system can be powered directly from a 12VDC battery
  • Highest quality precision dosing system - incomparable accuracy

Product Manuals & Documentation

SpectraPure® LiterMeter 3

Owner's Manual available for download in Adobe PDF file format

Manufacturer Info

SpectraPure Aquarium Supplies
SpectraPure was established in 1985 and is located in Tempe, Arizona, home of Arizona State University. SpectraPure is dedicated to excellence in the design and manufacture of water filtration and purification systems for household, commercial, laboratory and light industrial applications. Their product lines includes a full range of systems and equipment, including drinking water systems, water softeners, filtration systems, reverse osmosis units, RO/DI and deionization systems and many other technological innovations and water purification accessories. SpectraPure provides innovative, state-of-the-art solutions to water purity problems and applications.


Manufacturer`s Warranty: 5 years from date of purchase.

SHANE HM from Morehead City, NC UNITED STATE


Experience Level: Expert

A Must Have

If you are running a large system or dosing kalkwasser, this device is definetly for you. I got tired of adjusting my drip rate for my kalkwasser and trace elements on an almost daily basis and so I got this excellent piece f equipment which did not dissapoint. Takes no more than an hour to set up and once you program it, its set it and forget it. Definetly worth the money if you have the coin to spend.

4 out of 4 found this review helpful

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Experience Level: Expert

A great device

This is a fantastic little device. It works precisely as it is described. The build quality is excellent and the control interface is intuitive and obvious. Caution, however. If you buy this pump in part to do auto top-off, you should be aware that the pressure switch that Spectrapure sells as an accessory for that purpose will only control the water level to about +/-1" to 1.25". If you are looking for top-off control, go with the Spectrapure Ultra Precise Level Controller. Apart from this caveat, I have only praise for the LM3.

4 out of 4 found this review helpful

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Experience Level: Intermediate

Good Pump

The liter meter has performed flawlessly for me for about six months now. I couldn't be happier (unless they cut the price in half.) It is an expensive pump but it is also worth the price.

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Experience Level: Expert

Freeman Clark,M.D.

First thing you notice is quailty construction, second the instructions are precise, and third the device is flawless in performance. A must for aquarist who is serious about controlling reef additives.

1 out of 1 found this review helpful

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Experience Level: Intermediate

SpectraPure LiterMeter 3

This unit has been great so far. I used to be worried about overdosing kalk for my evaporation topoff. With the LiterMeter 3 I just set it and forget it! No more worries about adding too much of any supplement with this.

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Experience Level: Intermediate

Great product

This pump is well worth the investment. Easy to set up. Quiet. Reliable.

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Reefing Buddha from

Great product so far

Great product so far.. had it set up with 2 extra pumps, calibrated, and running within an hour of opening the packages. I can dose as little as 10ml per day, over 150 intervals. I tested it. Great

1 out of 1 found this review helpful

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ReefingBuddha from


Have been using about 2 months now and it is working perfectly. I have switched additives once to far and it took about 5-10 minutes to clean all three pumping units and get going again. Great!

2 out of 2 found this review helpful

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ReefFauna.com from

Very reliable pump

I have been using this pump for over 4 years and never had to do anything to it. It replaces 11 liters of evaporated water everyday, 7 days a week, 365 days a year. One of the very best investments.

5 out of 5 found this review helpful

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