--- product_id: 30139483 title: "RO/DI 150GPD Reverse Osmosis Dual DI Aquarium/Reef System. Clear. Manual Flush" brand: "fountainhead water system" price: "$791.33" currency: USD in_stock: true reviews_count: 8 category: "Fountainhead Water System" url: https://www.desertcart.us/products/30139483-ro-di-150gpd-reverse-osmosis-dual-di-aquarium-reef-system store_origin: US region: United States of America --- # 150 GPD high-capacity membrane Dual refillable DI cartridges Clear housings for easy monitoring RO/DI 150GPD Reverse Osmosis Dual DI Aquarium/Reef System. Clear. Manual Flush **Brand:** fountainhead water system **Price:** $791.33 **Availability:** ✅ In Stock ## Summary > 💧 Elevate your reef game with crystal-clear water perfection! ## Quick Answers - **What is this?** RO/DI 150GPD Reverse Osmosis Dual DI Aquarium/Reef System. Clear. Manual Flush by fountainhead water system - **How much does it cost?** $791.33 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/30139483-ro-di-150gpd-reverse-osmosis-dual-di-aquarium-reef-system) ## Best For - fountainhead water system enthusiasts ## Why This Product - Trusted fountainhead water system brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Ultra-Pure Aquarium Water:** Six-stage RO/DI filtration delivers near-zero TDS for pristine reef conditions. - • **Optimized Dual-Cartridge System:** Two cartridges in series maximize resin use, lowering operating costs while ensuring consistent water purity. - • **Cost-Effective Refillable Cartridges:** Dual DI cartridges are refillable and color-changing, saving you money without sacrificing quality. - • **Transparent Design for Instant Insight:** All-clear housings let you visually track filter status and maintenance needs at a glance. - • **Made in the USA with Proven Reliability:** Trusted Fountainhead system built for easy installation and long-term performance, even at low water pressure. ## Overview The RO/DI 150GPD Reverse Osmosis Dual DI Aquarium/Reef System by Fountainhead Water System is a six-stage filtration unit designed to produce ultra-pure water with a 150 gallons per day membrane capacity. Featuring dual refillable color-changing DI cartridges housed in clear casings, it offers cost-effective, easy-to-monitor water purification ideal for sensitive reef aquariums. Made in the USA, this system ensures reliable performance and long-term savings by maximizing resin use and simplifying maintenance. ## Description Six Stage RO/DI Aquarium System. 150 GPD Membrane. Dual DI REFILLABLE Color Changing Media Cartridges. ALL CLEAR HOUSINGS. Reverse Osmosis systems, combined with A DI after filter, will give you the lowest TDS reading for your aquarium water supply. DI Resin is necessary to reduce Total Dissolved Solids (TDS) to zero and is the last stage of an RO/DI unit. It is unnecessary to use the expensive proprietary DI cartridges that other RO manufacturers sell. Simply buy a refillable DI cartridge and fill with DI resin. You'll save money and get the same results. A constant supply of high purity water can be obtained by using two cartridges in series and allowing the first cartridge to completely depleted. During this operation, the second cartridge ensures that the water leaving the system is of the highest purity. New cartridges are placed into the polishing position and the remaining cartridge is put into the “roughing” position. This ensures complete utilization of all the exchange capacity, which lowers operating costs while increasing average quality.The clear cartridges are refillable, so you can save with buying media in bulk, and using the inline cartridges again, and again. Exported By ExportYourStore Review: Made in the United States - It’s bassackwards. In from the right out of the left. Are they sure it has a 150 gallon RO membrane? My other two from a reputable company have one membrane for 75 gph and 2 membranes for 150 gph. Very easy install with provided instructions. Working perfectly even without a water pressure booster. I’m at 40 psi. Adding booster will give you at least 80 psi. Review: Still a bargain compared to the "Saltwater specific recommended ones" - Long term user.... I bought my unit in 2019, I did add a booster pump with gauge and another membrane simply to be more efficient. never has it given me a problem and i Highly recommend it.. crazy at the price changes of our time in 2019 when I bought it it was $169 ## Features - Type:RO/DI AQUARIUM/REEF WATER FILTER, Country/Region Of Manufacture:United States - Brand:FOUNTAINHEAD WATER SYSTEM - Mpn:FH32RODI150 ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B01HOJ55RC | | ASIN | B01HOJ55RC | | Best Sellers Rank | #398,863 in Pet Supplies ( See Top 100 in Pet Supplies ) #1,657 in Aquarium Filters | | Brand Name | FOUNTAINHEAD WATER SYSTEM | | Customer Reviews | 4.5 4.5 out of 5 stars (74) | | Date First Available | June 28, 2016 | | Date First Available | June 28, 2016 | | Is Discontinued By Manufacturer | No | | Manufacturer | FOUNTAINHEAD WATER SYSTEM | | Manufacturer | FOUNTAINHEAD WATER SYSTEM | ## Images ![RO/DI 150GPD Reverse Osmosis Dual DI Aquarium/Reef System. Clear. Manual Flush - Image 1](https://m.media-amazon.com/images/I/917q4csybvL.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ Made in the United States *by 3***0 on June 26, 2025* It’s bassackwards. In from the right out of the left. Are they sure it has a 150 gallon RO membrane? My other two from a reputable company have one membrane for 75 gph and 2 membranes for 150 gph. Very easy install with provided instructions. Working perfectly even without a water pressure booster. I’m at 40 psi. Adding booster will give you at least 80 psi. ### ⭐⭐⭐⭐⭐ Still a bargain compared to the "Saltwater specific recommended ones" *by B***T on June 15, 2025* Long term user.... I bought my unit in 2019, I did add a booster pump with gauge and another membrane simply to be more efficient. never has it given me a problem and i Highly recommend it.. crazy at the price changes of our time in 2019 when I bought it it was $169 ### ⭐⭐⭐⭐ Good system. *by J***Y on April 19, 2022* It is a great starter system - especially if you are doing aquariums. Much cheaper than some comparable systems with exact same amount of stages. Only recommendation I have is change the DI resin if you want 0TDS. RO is producing 3ppm and I was not getting 0 output until I swapped out the resin. Not a big deal, it’s a disposable item of a system anyways. I make roughly 200 gallons/month with this unit. My water pressure is horrible where I live and get about 50 gallons in 32 hours. ## Frequently Bought Together - RO/DI 150GPD Reverse Osmosis Dual DI Aquarium/Reef System. Clear. Manual Flush - HM Digital DM-1 In-Line Dual TDS Monitor, 0-9990 ppm Range, +/- 2% Readout Accuracy,Blue & White - 1/4 inch Tube Float Valve Kit for RO Water Reverse Osmosis System water filter Push in to Connect Pipe Hose Tube Fittings CCK tube（ball valve +L+15 feet pipe） (blue) --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.us/products/30139483-ro-di-150gpd-reverse-osmosis-dual-di-aquarium-reef-system](https://www.desertcart.us/products/30139483-ro-di-150gpd-reverse-osmosis-dual-di-aquarium-reef-system) --- *Product available on Desertcart United States of America* *Store origin: US* *Last updated: 2026-05-19*