Santa Monica Filtration

Santa Monica Filtration RAIN4 Algae Scrubber


Earn cash back in Reward points
Sign up & Get up to 10%
Earn $39.95 in Reward points

Shipped by Santa Monica Filtration in 3-5 business days


Santa Monica Filtration RAIN4 Algae Scrubber

The RAIN4 is a pole-mounted 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. Unlike the previous mountable RAIN2, the RAIN4 includes a pole mount, and sees improvements with double the surface area for algal attachment, two additional LEDs (6 total), and a dual power supply.

  • Can be placed anywhere in your sump, as low to the water as you like, saving space
  • No shelf or bracket required: Use the pole mount (included with the RAIN4) to place the RAIN4 on the bottom of your sump
  • Includes a 2 mm thick, 2 sided, 48 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
  • Dual power supply with two 10 ft (300 cm) power cords with simple 2-prong a U.S. plugs, 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 6 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, 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)
  • Lights are controlled by 2 power supplies so that you can start off with fewer lights when needed and control them easier with a controller if you have one. Two power supplies is also great for backup, in order to always have some of the lights operating (photosynthesis water filtering only works when illuminated).
  • Power supplies are 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 (without mount): 10" long x 5" wide x 13" high (25cm long x 12.5cm wide x 32cm high). Dimensions with pole mount will depend on your choice of pole mount segments.
  • 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: 6 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

Product Manuals & Documentation

Santa Monica Filtration RAIN4 Algae Scrubber

Owner's Manual available for download in Adobe PDF file format
Ask a Question Earn 15 Points when you answer a question
Sort By :
9 Questions
Displaying questions 1-9

Free, Fast, and Flexible Shipping Options

  • $5.99 flat rate shipping for orders under $39

    Most orders under $39 ship for only $5.99 using a mix of economy shipping methods including UPS Ground, USPS First Class, and/or SurePost. Your order will be delivered in up to 7 business days after it ships out.

  • free shipping for orders $39+

    We ship 99% of the products we carry for free within the contiguous United States using a mix of economy methods including USPS First Class Mail, SurePost and UPS Ground. Your order will arrive in up to 7 business days. Just spend $39 or more!

  • free faster shipping for orders $250+

    Over 90% of shoppers receive their orders within 1-2 business days. Upgrade from free economy shipping to faster shipping for only $5.99—or spend $250 and we'll upgrade you automatically!

  • need your order even faster? no problem!

    Expedited shipping services are available for most products if you are in a hurry. Get guaranteed delivery in 2 business days, 1 business day, or next day by 10:30 am. Costs vary by location.

  • buy it today and we'll ship it today

    Same-day shipping is available Monday-Friday for most products—place your order by 10:30 am PST. Pre-ordered and back-ordered items do not qualify, nor do drop-shipped, live, or frozen shipments.

  • live plants, live foods, and frozen foods delivered to your door

    We ship live plants, live foods, and frozen foods within the contiguous United States. Each of these categories is subject to its own $19.99 flat-rate shipping fee to cover the special packaging and/or expedited shipping costs required to ensure safe delivery. Orders with 12+ live plants ship free!

Learn More About Shipping

60-Day Return Period with Easy Online Returns

Return any new and unused item within 60 days for a full refund. Having difficulty with a product? Contact us to speak with an aquarium expert. If you need a replacement, fill out this form.

A small segment of the 180+ brands we carry require that customers contact them directly if/when problems arise. You can view the full list of those brands and get their contact info here.

We are unable to accept returns of Digital Aquatics, Neptune Systems, Vertex Aquaristik, Aqua Illumination (AI), EcoTech Marine, GHL, or Seneye products once the manufacturer's packaging seals have been broken.

Marine Depot is an authorized reseller for every product we carry. That means when you buy aquarium supplies from us, your products are not only backed by our own 60-day return policy, they also carry full factory warranties, where applicable. Some items have a 1-year warranty, others have limited lifetime warranties. Warranty coverage varies from manufacturer to manufacturer, so please read the product description of the item(s) you are considering thoroughly for details or contact us if you have warranty questions.

Learn More About Returns

Earn 5% Cash Back for Most Purchases

Rack up reward points to earn discounts on future purchases! You can earn reward points by creating an account, writing reviews, referring friends, subscribing to our newsletter, buying products, and more!

  • Earn 5 reward points for every $1 you spend to get 5% cash back
    Most Products
  • Earn 1 reward point for every $1 you spend to get 1% cash back
    Abyzz, American Marine, AquaIllumination, AutoAqua, CoralVue, Digital Aquatics, EcoTech Marine, Giesemann, GHL, Hanna Instruments, Hydor, IceCap, Innovative Marine, Iwaki, Kamoer, Kessil, Klir, Korallen-Zucht, Maxspect, Mur-lok, Nano Box, Neptune Systems, NYOS, Oceanbox Designs, Pax Bellum, Radium, Red Sea, Reef Glass, Reef Octopus, Seneye, Somatic, Tunze, Vertex Aquaristik, and Waterbox Aquariums

You can also get bonus reward points by purchasing select items during special sales and promotions.

Learn More About Rewards

6Y2518 Santa Monica Filtration RAIN4 Algae Scrubber // Santa Monica Filtration InStock 799.00 USD 0.0 0