Aquatic Life Classic 100 GPD, 4 Stage RO/DI Unit $119.99
Aquatic Life Classic RO/DI unit with a 100gpd RO Membrane, manual flush, auto shut off valve, pressure change and all your tubing and garden hose fitting. Includes all your filters (sediment, carbon & DI)
https://premiumaquatics.com/products...ro-junior.html

Aquatic Life Classic 50 GPD, 3 Stage RO $109.99
Aquatic Life Classic RO only unit with a 50gpd RO Membrane. This unit is perfect for someone needing RO only, or if you wanted to get into a 5 stage unit without spending as much money. You could get this RO 3 stage and the Dual DI below to create a nice 5 stage system.
https://premiumaquatics.com/products...e-ro-unit.html

Aquatic Life Classic Dual Deionization Unit (DI,DI) $59.99
Convert your RO unit into a 5 stage RO/DI in a snap. This Aquatic Life Dual DI unit comes with everything you need and even the DI carts. At 59.99 it's a steal.
https://premiumaquatics.com/products...unit-didi.html

Aquaticlife Single Clear 10-Inch Canister Housing w/Tubing $23.99
Incredible price of only 23.99 for an add-on canister housing, tubing, bracket and a wrench. You can use this for an additional micron or carbon filter. Run it after your RO to create a DI stage or add additional DI stages. You could even make this into a filter reactor.
https://premiumaquatics.com/products...g-wtubing.html

Aquatic Life Twist-In (TI) 100 GPD, 4-Stage RO/DI Unit
Reg 124.99, Sale Price $112.49
The Aquatic Life Twist-In 100 GPD 3-Stage Reverse Osmosis (RO) and 4-Stage Reverse Osmosis Deionization (RODI) filtration systems are very compact water purification solutions that efficiently combine reverse osmosis RO and DI technology with our quick and easy to change twist-in replacement filter cartridges.
https://premiumaquatics.com/products...it-tfc-di.html