Description
IceCap 100 GPD RO/DI System — The Sweet Spot for Growing Reef Systems
The most popular capacity in the IceCap RO/DI line — enough output for a growing tank without stepping up to a commercial-size unit.
As your reef grows, so does your water demand — bigger water changes, more frequent top-off, maybe a second tank down the line. The IceCap 100 GPD System delivers up to 100 gallons of pure, 0 TDS water per day, giving you real breathing room over entry-level units without the size or cost of the high-capacity models.
It uses the same Dow Filmtec membrane found in our top-of-the-line 200 GPD system, so you're getting proven, commercial-grade filtration technology in a size built for the everyday reef keeper.
Why Reefers Choose the IceCap 100 GPD
- 100 GPD output — real headroom for growing tanks and frequent water changes
- 3:1 waste ratio — standard efficiency for this capacity range
- Dow Filmtec TW30-1812-100HP membrane — 96–98% typical salt rejection at 65 PSI, the same membrane used in our 200 GPD system
- Color-changing DI resin — see exactly when it's time to refill, no guesswork
- Auto shut-off valve — stops water flow automatically once storage is full, no wasted water or flooded floors
- No electricity required — runs entirely on household water pressure (65–80 PSI)
- Compact footprint — 16" x 6.5" x 18", same size as the rest of the IceCap line
Built For
- Growing reef systems where weekly water change volume is increasing
- Hobbyists who want output headroom without jumping to a commercial-size unit
- Reef keepers planning to add a second tank or frag rack
- Anyone with 65–80 PSI household water pressure who wants dependable, consistent output
What's Included
Auto shut-off valve, manual flush flow restrictor, glycerin-filled pressure gauge, refillable DI cartridge, and all installation fittings and tubing — everything you need to get up and running.
Specs at a Glance
| Spec | Detail |
| Model | IC-RI100 |
| Output | 100 GPD |
| Dimensions | 16" x 6.5" x 18" (L x W x H) |
| Waste Ratio | 3:1 |
| Salt Rejection | 96–98% |
| Membrane | Dow Filmtec TW30-1812-100HP |
| Water Pressure Required | 65–80 PSI |
| Power Required | None |
| Filter/Canister Size | Standard 10" |
| Fittings | 1/4" push-connect |
Want a better waste ratio at a similar footprint? The 150 GPD steps up to a 1.5:1 waste ratio — worth a look if water efficiency matters to you.
Standard 10" canisters and 1/4" push-connect fittings mean replacement filters are always easy to find — no proprietary parts, no supply headaches down the line.
Backed by CoralVue's standard warranty. Questions before you buy? Contact us — we run these systems ourselves at our own coral farm.
Compare IceCap RO/DI Systems by GPD
| 70 GPD | 100 GPD | 150 GPD | 200 GPD | |
| Model | IC-RI75 | IC-RI100 | IC-RI150 | IC-RI200 |
| Best For | Nano & small setups | Growing tanks, frequent WCs | Larger displays, multi-tank | Frag farms, high-volume ops |
| Waste Ratio | 3:1 | 3:1 | 1.5:1 | 1.5:1 |
| Salt Rejection | 96–98% | 96–98% | 96–98% | 96–98% |
| Membrane | Dow Filmtec TW30-1812-75 | Dow Filmtec TW30-1812-100HP | Dow Filmtec (150 GPD spec) | Dow Filmtec TW30-1812-100HP |
| Water Pressure | 65–80 PSI | 65–80 PSI | 65–80 PSI | 65–80 PSI |
| Dimensions | 16" x 6.5" x 18" | 16" x 6.5" x 18" | 16" x 6.5" x 18" | 16" x 6.5" x 18" |
| Power Required | None | None | None | None |
Not sure which size is right for you? As a rule of thumb: match your GPD to roughly 3–5x your weekly water change volume so your system keeps up without running constantly. Low incoming pressure? Every model pairs with the IceCap Booster Pump Kit to hit peak output.
Warranty & Support
CoralVue and IceCap guarantee this product to be free from defects in material and workmanship. View full warranty details →
Have a question or need to submit a warranty claim? Visit the CoralVue Support Portal →