RAIN2

All other waterfall algae scrubber designs (which we created in 2008; see Ats2008.org) require you to disconnect and disassemble the unit to get to the growth on the bottom tray. This was a problem. The RAIN2 and RAIN4, which we created to solve this issue, allow you to lift off the LED dome lid with one hand so you can observe any growth on the tray, and then you can lift the tray off of the water pipe also with one hand (as shown) to take it to your sink. And you never have to turn off the water flow when doing this.

Attachment 8336

Inside a RAIN2 dome LED lid, showing two of the four GEM5 lights plugged in and operating on opposite sides of the screen, with one higher and one lower, so that the screen is not saturated on both sides with light at any one spot (this is a typical step for a new screen that is filling in).

Attachment 8346

RAIN2 which looks like the first week operating in high-nutrient water. One of the GEM5 lights is turned on, at the bottom on one side. Note the good even flow of water off the bottom of the screen.

Attachment 8391

RAIN2 waterfall algae scrubber from a saltwater sump, showing black slime growth that has just been brushed clean. Dark and black slime like this should be brushed completely off, including out of the screen holes, because the slime cannot hold on well to a waterfall screen (it can however hold on well to Green Grabber rocky textures in upflow models).

http://algaescrubber.net/forums/show...he-best-filter
http://algaescrubber.net/forums/show...-it-looks-like

Attachment 8398

A double setup of RAIN2 waterfall scrubbers; this makes cleaning one easy, while the other continues growing

Attachment 8400

RAIN2 being scraped with a credit card, after being lifted up out of the tray:

Attachment 8417

This RAIN2 (tm) dome lid has only two GEM5® siliconed in, but two more can be easily added later.

Attachment 8418

This RAIN2 waterfall scrubber is tucked down into a sump compartment, but not all the way down to the waterline.

Attachment 8426

This RAIN2 really needs to be cleaned/harvested sooner. The slime is great at filtering, but you don't want it letting go down the drain:

http://algaescrubber.net/forums/show...he-best-filter

Attachment 8432

This RAIN2 is turned sideways, with the optional pole mount, and is lowered down so the tray is touching the sump waterline. This gives dead silent operation and (if the water rises up enough when the return pump is turned off) will keep the growth wet and alive during a power outage:

Attachment 8437