RO/DI Systems Deals

Compare prices on ro/di systems across multiple retailers

Prices and availability change; we are not paid by these stores.

Reference reading: Species guide on Codexery

Species guides on Codexery

Fire shrimp — Scientific name: Lysmata debelius · Distribution: Indo-Pacific source
Pajama cardinalfish — Scientific name: Sphaeramia nematoptera · Family: Apogonidae source
Spotted seahorse — Scientific name: Hippocampus kuda · Maximum length: 17–30 cm source

More guides on Codexery

Hot DealsTop discounts right now

JBJ Mini Arctica Chiller 1/15 HP (DBA-050-D)

Bulk Reef Supply

Price checked today

$497.11🏷️ -15%

TESZLA evo marine LED Aquarium Light Fixture (Silver) Aquaristic

Bulk Reef Supply

Price checked today

$323.19🏷️ -19%

Bulk GFO Granular Ferric Oxide - High Capacity (1 Gallon) - Bulk Reef Supply

SaltwaterAquarium.com

Price checked today

$243.64🏷️ -15%

LiquidArt AIO Acrylic Aquarium w/ Cabinet (75 Gallons) - LiquidArt

Bulk Reef Supply

Price checked today

$1979.10🏷️ -10%

Eshopps Mariner 70 Rimless Aquarium w/ Stand 70 gal Black

Fish Tanks Direct

Price checked today

$1913.00

60 products found

SaleAll-Time LowPrice Drop

4 Stage Value Plus 200GPD Water Saver RO/DI System

RO/DI Systems

$255.14-19%

$314.99Save $59.85

Bulk Reef Supply$255.14

Price checked today

Price Drop

4-Stage (100 GPD) Twist In RO/DI System - Aquatic Life

RO/DI Systems

$118.99-15%

$139.99Save $21.00

SaltwaterAquarium.com$118.99

Price checked today

All-Time LowSalePrice Drop

4 Stage Value 75GPD RO/DI System

RO/DI Systems

$145.79-19%

$179.99Save $34.20

Bulk Reef Supply$145.79

Price checked today

All-Time LowSalePrice Drop

4 Stage Value Plus 150GPD Water Saver RO/DI System

RO/DI Systems

$240.56-19%

$296.99Save $56.43

Bulk Reef Supply$240.56

Price checked today

All-Time LowPrice DropHOT

AquaFX 1-3 Bath Whole House Carbon Filtration System Non-Backwash

RO/DI Systems

$599.99-33%

$899.99Save $300.00

Fish Tanks Direct$599.99

Price checked today

SaleAll-Time LowPrice Drop

4 Stage Value Plus 100GPD RO/DI System

RO/DI Systems

$225.98-19%

$278.99Save $53.01

Bulk Reef Supply$225.98

Price checked today

All-Time LowSalePrice Drop

4 Stage Value 150GPD Water Saver RO/DI System

RO/DI Systems

$196.82-19%

$242.99Save $46.17

Bulk Reef Supply$196.82

Price checked today

Price Drop

Bulk Deionization Resin Mixed Bed (Color Changing) RODI (1.1 lbs)

RO/DI Systems

$16.14-15%

$18.99Save $2.85

SaltwaterAquarium.com$16.14

Price checked today

Price Drop

Bulk Deionization Resin - Color Changing (1.25 lbs) - Bulk Reef Supply

RO/DI Systems

$16.14-15%

$18.99Save $2.85

SaltwaterAquarium.com$16.14

Price checked today

Price Drop

PRO Series Purple Cation DI Resin - Color Changing - Part 1 (1.25 lbs) - Bulk Reef Supply

RO/DI Systems

$15.29-15%

$17.99Save $2.70

SaltwaterAquarium.com$15.29

Price checked today

Price Drop

RO TFC Membrane 100 GPD - Aquatic Life

RO/DI Systems

$46.74-15%

$54.99Save $8.25

SaltwaterAquarium.com$46.74

Price checked today

Price Drop

10" Carbon Block Filter Cartridge (1.0 Micron) - Generic

RO/DI Systems

$12.74-15%

$14.99Save $2.25

SaltwaterAquarium.com$12.74

Price checked today

Price Drop

10" RODI Standard (0.5 Micron) Coconut Carbon Block Filter

RO/DI Systems

$12.74-15%

$14.99Save $2.25

SaltwaterAquarium.com$12.74

Price checked today

SalePrice DropAll-Time Low

4 Stage Value Plus 75GPD RO/DI System

RO/DI Systems

$182.24-19%

$224.99Save $42.75

Bulk Reef Supply$182.24

Price checked today

All-Time LowPrice DropHOT

AquaFX Water Softener 32,000 Grain Timed-Regen

RO/DI Systems

$749.99-32%

$1099.99Save $350.00

Fish Tanks Direct$749.99

Price checked today

Price Drop

Twist-In RO Carbon Filter - Aquatic Life

RO/DI Systems

$12.74-15%

$14.99Save $2.25

SaltwaterAquarium.com$12.74

Price checked today

Price Drop

Twist-In RO Sediment Filter - Aquatic Life

RO/DI Systems

$11.89-15%

$13.99Save $2.10

SaltwaterAquarium.com$11.89

Price checked today

Price Drop

PRO Series Blue Anion Deionization Resin - Color Changing - Part 2 (1.5 gallons / 8.1 lbs) - Bulk Reef Supply

RO/DI Systems

$66.29-15%

$77.99Save $11.70

SaltwaterAquarium.com$66.29

Price checked today

Price Drop

PRO Series Purple Cation DI Resin - Color Changing - Part 1 (1.5 gallons / 8.1 lbs) - Bulk Reef Supply

RO/DI Systems

$65.44-15%

$76.99Save $11.55

SaltwaterAquarium.com$65.44

Price checked today

Price Drop

RO TFC Membrane 50 GPD - Aquatic Life

RO/DI Systems

$33.99-15%

$39.99Save $6.00

SaltwaterAquarium.com$33.99

Price checked today

Price Drop

Twist-In RO Mixed Bed Color Changing Deionization Filter - Aquatic Life

RO/DI Systems

$25.49-15%

$29.99Save $4.50

SaltwaterAquarium.com$25.49

Price checked today

Price DropSaleAll-Time Low

75 GPD Reverse Osmosis Membrane - Dow Filmtec

RO/DI Systems

$34.67-15%

$39.99Save $5.32

Bulk Reef Supply$34.67

Price checked today

Price Drop

MetaSorb High Capacity Metals Absorption Cartridge Filter - Two Little Fishies

RO/DI Systems

$68.00-15%

$80.00Save $12.00

SaltwaterAquarium.com$68.00

Price checked today

Price Drop

Essentials RODI Connection Pack - Aquatic Life

RO/DI Systems

$25.49-15%

$29.99Save $4.50

SaltwaterAquarium.com$25.49

Price checked today

Price Drop

Bulk Deionization Color Changing Resin (5 Liter Bag/8.14 lbs.) - Aquatic Life

RO/DI Systems

$76.49-15%

$89.99Save $13.50

SaltwaterAquarium.com$76.49

Price checked today

All-Time LowPrice DropHOT

AquaFX 3-5 Bath Whole House Carbon Filtration System Non-Backwash

RO/DI Systems

$749.99-29%

$1049.99Save $300.00

Fish Tanks Direct$749.99

Price checked today

All-Time LowPrice DropHOT

AquaFX Water Softener 32,000 Grain Metered-Regen

RO/DI Systems

$899.99-28%

$1249.99Save $350.00

Fish Tanks Direct$899.99

Price checked today

All-Time LowPrice DropHOT

AquaFX Water Softener 48,000 Grain Timed-Regen

RO/DI Systems

$899.99-28%

$1249.99Save $350.00

Fish Tanks Direct$899.99

Price checked today

Price Drop

Replacement Media Set for Poly Bio-Marine Kold Ster-il

RO/DI Systems

$71.39-15%

$83.99Save $12.60

SaltwaterAquarium.com$71.39

Price checked today

Price Drop

Bulk Deionization Color Changing Resin (1 Liter Bag/1.63 lbs.) - Aquatic Life

RO/DI Systems

$21.24-15%

$24.99Save $3.75

SaltwaterAquarium.com$21.24

Price checked today

Price Drop

Universal Color Changing Mixed Bed DI 10-Inch Cartridge - Aquatic Life

RO/DI Systems

$21.24-15%

$24.99Save $3.75

SaltwaterAquarium.com$21.24

Price checked today

Price DropAll-Time LowSale

BRS 4 Stage RO Only System - 75GPD

RO/DI Systems

$131.21-19%

$161.99Save $30.78

Marine Depot$131.21

Price checked today

Price Drop

TRM-1 Three-Sensor TDS Monitor - HM Digital

RO/DI Systems

$36.54-15%

$42.99Save $6.45

SaltwaterAquarium.com$36.54

Price checked today

Price Drop

Bulk Deionization Resin - Color Changing (1.5 gallons - 7.5 lbs) - Bulk Reef Supply

RO/DI Systems

$59.49-15%

$69.99Save $10.50

SaltwaterAquarium.com$59.49

Price checked today

All-Time LowPrice DropHOT

AquaFX Water Softener 48,000 Grain Metered-Regen

RO/DI Systems

$1049.99-25%

$1399.99Save $350.00

Fish Tanks Direct$1049.99

Price checked today

Price Drop

Bulk Deionization Resin Mixed Bed Full 10" Cartridge (Color Changing) RODI

RO/DI Systems

$19.54-15%

$22.99Save $3.45

SaltwaterAquarium.com$19.54

Price checked today

Price DropAll-Time LowHOT

Sediment Cartridge for AquaReady RO System

RO/DI Systems

$5.90-44%

$9.99Save $4.09

Marine Depot$5.90

Price checked today

Price Drop

PRO Series Mixed Bed DI Resin Purple Cation - Color Changing - Part 3 (1.25 lbs) - Bulk Reef Supply

RO/DI Systems

$16.99-15%

$19.99Save $3.00

SaltwaterAquarium.com$16.99

Price checked today

SalePrice DropAll-Time Low

Case (25) of BRS Universal Carbon Block Filters - 1 Micron

RO/DI Systems

$315.89-19%

$386.99Save $71.10

Bulk Reef Supply$315.89

Price checked today

Price Drop

Twist-In RO Membrane Filter - Aquatic Life

RO/DI Systems

$50.99-15%

$59.99Save $9.00

SaltwaterAquarium.com$50.99

Price checked today

Price Drop

R/O Recharge (1 lb - 16 oz) - Fritz Aquatics

RO/DI Systems

$12.79-15%

$14.99Save $2.20

SaltwaterAquarium.com$12.79

Price checked today

SalePrice DropAll-Time LowHOT

Mixed Bed DI Cartridge Non Ind... Mixed Bed DI Cartridge Non Indicating HI Capacity 10" (DI-MB-10HC)

RO/DI Systems

$35.00-30%

$49.99Save $14.99

Aquarium Specialty$35.00

Price checked today

Price Drop

PRO Series Blue Anion Deionization Resin - Color Changing - Part 2 (1.4 lbs) - Bulk Reef Supply

RO/DI Systems

$14.44-15%

$16.99Save $2.55

SaltwaterAquarium.com$14.44

Price checked today

All-Time LowPrice DropSale

Case (40) of GE ROSAVE.Z Depth Filters - 1 Micron

RO/DI Systems

$246.49-15%

$289.99Save $43.50

Marine Depot$246.49

Price checked today

SalePrice DropAll-Time Low

Case (40) of GE ROSAVE.Z Depth Filters - 5 Micron

RO/DI Systems

$212.49-15%

$249.99Save $37.50

Marine Depot$212.49

Price checked today

SalePrice DropAll-Time Low

Case (20) 10" - 1 Micron MATRIKX CTO Plus Carbon Block

RO/DI Systems

$181.04-15%

$207.99Save $26.95

Marine Depot$181.04

Price checked today

Price DropAll-Time Low

Case (40) - 2.5" x 10" - 1 Micron Purtrex Depth Sediment Filter

RO/DI Systems

$193.31-10%

$209.99Save $16.68

Marine Depot$193.31

Price checked today

SalePrice DropAll-Time Low

Aquatec Power Supply for CDP-8800 Pump

RO/DI Systems

$33.99-15%

$38.19Save $4.20

Bulk Reef Supply$33.99

Price checked today

All-Time LowPrice Drop

AquaFX Ultimate Whole House Filtration System

RO/DI Systems

$1999.99-18%

$2449.99Save $450.00

Fish Tanks Direct$1999.99

Price checked today

Price DropSale

Triple Bracket for Standard 10” RO Canisters (U Style)

RO/DI Systems

from $8.74-20%

$10.79Save $2.05

2 Vendors$8.74

Price checked today

Price DropAll-Time Low

Wrench for Reverse Osmosis Canister

RO/DI Systems

$2.87-20%

$3.59Save $0.72

Bulk Reef Supply$2.87

Price checked today

Price DropAll-Time Low

Drain Saddle Clamp - Push Connect

RO/DI Systems

$3.19-20%

$3.99Save $0.80

Marine Depot$3.19

Price checked today

All-Time LowSalePrice Drop

Dual Deionization Canister

RO/DI Systems

from $45.92-19%

$56.69Save $10.77

2 Vendors$45.92

Price checked today

Price DropAll-Time LowSale

Triple DI Saver with TRM-1 Triple TDS Meter

RO/DI Systems

$76.54-19%

$94.49Save $17.95

Marine Depot$76.54

Price checked today

SaleAll-Time LowPrice Drop

Dual DI Phosphate CO2 & Silica Eliminator with DM-1 Dual TDS Meter

RO/DI Systems

$58.31-19%

$71.99Save $13.68

Marine Depot$58.31

Price checked today

All-Time LowSalePrice Drop

150 GPD Reverse Osmosis Membrane

RO/DI Systems

$51.02-19%

$62.99Save $11.97

Bulk Reef Supply$51.02

Price checked today

Price DropAll-Time LowSale

BRS Chlorine & VOC Carbon Block Filter - 5 Micron

RO/DI Systems

$8.74-19%

$10.79Save $2.05

Marine Depot$8.74

Price checked today

Price DropAll-Time Low

AquaFX Water Softener 48,000 Grain Twin-Alternating Metered-Regen

RO/DI Systems

$2299.99-16%

$2749.99Save $450.00

Fish Tanks Direct$2299.99

Price checked today

Price DropAll-Time LowSale

BRS Reverse Osmosis Chloramines Monster

RO/DI Systems

$269.72-19%

$332.99Save $63.27

Marine Depot$269.72

Price checked today

Price Drop

Water Saver Upgrade Kit

RO/DI Systems

$49.72-15%

$58.49Save $8.77

Marine Depot$49.72

Price checked today