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Rain2 Algae Scrubber - Santa Monica Filtration


Starting at $32/mo with . Learn more

Item #: 6Y24142

Shipped by Santa Monica Filtration in 7-10 business days

Santa Monica Filtration RAIN2 Algae Scrubber

The RAIN2 is a pole-mountable (pole mount sold separately) Waterfall Algae Scrubber with waterproof submersible GEM5 lights and a Green Grabber screen, designed to reduce your glass cleaning and water changes while creating an environment for living micro-animals to grow inside the scrubber.

  • Can be placed anywhere in your sump, as low to the water as you like, saving space
  • Includes a 2 mm thick, 2 sided, 24 square inch Green Grabber® algae attachment screen, designed for enhanced algal growth
  • Will run on both 120V and 240V
  • Submersible GEM5 lights keep the 240 or 120 volts far (2 meters) away, with only a safe low voltage going into your sump area
  • Includes a 10 ft (300 cm) power cord with simple 2-prong a U.S. plug, which can be easily modified
  • Dry-Out proof: Power outages will not affect it if you place it low enough in your sump
  • Can be used as a stand-alone filter or in conjunction with most other filters
  • Includes a 1 year warranty for replacement or repair
  • Requires a water pump that can pump at least 200 gph (760 lph) water flow 24 hours a day. 300 gph (1135 lph) might be better to fill up all areas of the screen
  • Includes a 1 ¾” (44.5mm) diameter drain hole, which can be used with a standard 1” ID drain bulkhead and a standard 1” (25mm) schedule 40 pvc pipe
  • Requires 4" (10cm) head room to remove lid if placing in sump or cabinet

  • Includes 4 LED, submersible GEM5 strip lights mounted inside the dome lid cover
  • Additional GEM5 lights are sold HERE and can be mounted to the dome using silicone glue
  • Each GEM5 light uses 5 real watts (volts X amps) for the power; it does not use "equivalent" watts like CFL lights do (As a result,m= each GEM5 light puts out the same algal-growth illumination that a "larger" 10 watt LED or 20 watt CFL bulb does)
  • Each GEM5 is pure deep red 660nm (nanometer), which is the primary growth spectrum for macroalgae (seaweed)
  • Power supply is fully isolated, low-voltage, and CE, UL, Canadian UL, and FCC approved
  • Patent-pending case is a solid, high-tech material which not only completely seals the LEDs when under water, but also removes heat from the LEDs when above the water
  • The lights require no cooling fans or heat sinks
  • Lights can be put on a timer to improve growth and filtering
  • Underwater Rated: IP65, IP66, IP66K, IP67, IP68, IP69K (high pressure steam proof)

  • Dimensions: 10" long x 5" wide x 8" high (25cm long x 12.5cm wide x 20cm high)
  • Required Head Room: RAIN2 will need 4" (10cm) above the top of the light-cover dome lid in order to remove the lid. However you can lift the whole tray unit up off of a pole mount, with as little as 2" (5cm) head room
  • LEDs: 4 deep red (660nm), 5 watt submersible & waterproof LED GEM5 strip lights
  • Drain Pipe (optional): You can add one by using a standard 1" ID drain bulkhead which fits standard 1" (25mm) schedule 40 pvc pipe. The drain hole in the tray is 1 3/4" (44.5mm) diameter

1 - 5 Gallons 5 - 10 Gallons 10 - 40 Gallons 55 - 120 Gallons 180 - 300 Gallons 450+ Gallons
RAIN2 x2 x3 x5
DROP.2 x2
Saltwater only
HOG.5 x2
x2 x4
HOG1.3 x2 x4
HOG2 x2 x3 x5
Saltwater only
x2 x3 x4
Saltwater only
x2 x3 x5
Saltwater only
x2 x4
Saltwater only

5 Stars


Reviewed on
May 21, 2020

Yes, I would recommend this.

Santa Monica Scrubber

Pros: Well made, High Quality

Cons: stand is not affordable if you can even find it. $10.00 and you can make one yourself

Seems to be very well made. I plumbed it in to my sump with my own stand pipe and flat Lexan 11 x 6 plate. Note the stand is not located on the Marine Depot site or at least I could not find it. I used a 1.5 bulk head fitting in the drain and used 1 inch PVC pipe for extra support and drain. I am a couple weeks away from the tanks first cycle. I saw the scrubber on CJs you tube channel (he gave me a lot of knowledge) I think the scrubber is a must have to fight algae growth. Marine Depot is great but the shipping of this unit was very slow "but free"

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Reviewed on
March 19, 2019

Yes, I would recommend this.

Great Build Quality

Pros: Quality

Cons: None

It seems that Santa Monica People care about their products. It came with detailed instructions and pictures. Pretty easy to install and start. I use a Life Guard Quiet One 1200 that I bought here. So far so good

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Reviewed on
February 13, 2019

Yes, I would recommend this.



Cons: NONE

I really like the scrubber because it works great and it holds all the light in the housing. It also keeps the salt spray in the housing too.
since adding the scrubber to my system it has reduced phosphate and cleared up my tank.

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Reviewed on
March 03, 2018

Yes, I would recommend this.

Very nice product

Pros: Thick plastic housing /tray, Proprietary waterproofLEDs

Cons: None

Algae, nature’s filter, whether macroalgae reactor or rain type algae scrubber. After watching many videos over the last couple years, I decided to try Santa Monica. The gentlemen in all his videos shows a real concern for his product. I purchased a rain2 from Marine Depot and a Hog 3 from another company to do my own comparison on my 150 gallon tank. The rain is heavy duty, compact unit with real nice LED’s. The post was my preference. I connected a 90 on the end of the supplied pvc which I attached the 3/4 nipple, also supplied. I made a long rectangular notch from the top of the 2 inch pvc to where the 90 elbow/ barb would stick out. Therefore I can easily slide the whole unit off the 2 inch pedestal. I connected the palm size Eheim compact 1000 with a small piece of tubing so it is suspended freely. Plugged everything in and everything is functioning. Very detailed instructions for developing the algae. This is the most compact unit available. No worries if leak develops as the tray sits about 1/2 inch above the sump surface water. Very quiet. Nicely engineered and well thought through. The screen is easy to remove. Would recommend.

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