Bulk Reef Supply Value to Deluxe RO/DI Upgrade Kit Review: A 6-Stage Answer to Chloramines

Introduction

If your reef tank runs on city water, the water arriving at your tap may not be what your RO/DI system was originally set up to handle. Many municipalities have shifted from chlorine to chloramine disinfection, and that change has real consequences for the filtration stages sitting under your sink or in your utility room. Chloramine is a combination of chlorine and ammonia, and it behaves differently from chlorine in a filtration train.

The Bulk Reef Supply Value to Deluxe RO/DI Upgrade Kit exists for exactly this situation. It converts an existing 4-Stage RO/DI unit into a 6-Stage system designed around chloramine removal, membrane protection, and longer DI resin life, without requiring a brand new unit.

The kit is a targeted fix rather than a full replacement, which makes it a sensible first step if your current 4-Stage system is otherwise working well and your main concern is water chemistry upstream of the membrane.

Who This Kit Is For

This upgrade is aimed at reef keepers whose source water is treated with chloramines. A rough indication of how common that has become: nearly half of reefers relying on city water may now have chloramines in their tap water, so it is worth confirming rather than assuming.

It is also relevant if you have noticed your DI resin discolouring after only a few normal uses, which is one of the visible signs that chloramines are reaching the later stages of the system untreated.

Finally, the kit is built for owners of Bulk Reef Supply 4-Stage RO/DI units. Compatibility is stated as covering any of those units, and the installation adds one canister before the system and one after it.

Main Strengths

The kit’s value comes from three connected ideas: removing chloramines effectively, protecting the components downstream, and softening the impact when a cartridge reaches the end of its life.

Handling Chloramines With a Second Carbon Block

There is no single filter that removes chloramines a hundred percent effectively, at least not for very long. That is the reasoning behind using two carbon blocks instead of one, and it is the core of this upgrade. The kit includes an additional universal carbon block, and the extra canister is installed ahead of your existing system so that chloramine reduction happens before the water reaches the RO membrane.

Because the added stage sits upstream, it protects everything that follows rather than trying to clean up water that has already passed through the membrane. That ordering is the part that matters most for long-term results.

Protecting the RO Membrane and DI Resin

Chloramines have damaging oxidizing effects on an RO membrane, and that is one of the main reasons this upgrade is worth considering rather than deferring. Untreated chloramines that carry through to the membrane and DI stages tend to show up quickly in resin colour, often after just a few normal uses.

Changing DI resin more often than necessary is both time consuming and expensive, and the cost adds up faster than most people expect. Addressing the problem before the membrane and resin stages means those consumables are asked to do less work, which is the practical argument for treating chloramines early in the train.

Two DI Stages as an Ammonia Buffer

The third benefit is protection against a sudden release of ammonia if your DI resin becomes fully exhausted before you get around to changing it. A single exhausted resin stage leaves no margin, while two DI resin stages can help prevent an ammonia surge and provide a buffer of time between changes.

That buffer is what turns an inconvenient maintenance schedule into a forgiving one. The second DI chamber is installed after your existing system as part of the same upgrade.

For anyone who has ever realised too late that a resin cartridge was spent, this is the most quietly useful part of the package.

Things to Consider Before Buying

The first step is confirming that chloramines are actually in your water. Almost every municipality publishes an annual water report, and a quick search for your city’s report will tell you which disinfectant is in use. If your supply is treated with chlorine rather than chloramine, the case for this particular upgrade is weaker.

Compatibility is also specific. The kit is described as compatible with Bulk Reef Supply 4-Stage RO/DI units, so it is not a universal retrofit for every filtration system on the market.

Installation adds two canisters, one before and one after your current setup, so it is worth checking the space available wherever your unit lives, along with your routine for replacing cartridges. More stages means more consumables to track over time.

One practical add-on: the RO Tube Cutter is a worthwhile inclusion with the order. It is described as the right tool for this job and makes the upgrade installation noticeably easier than cutting tubing with whatever is closest to hand.

Buying Advice

If your water report lists chloramines as the disinfectant, and you already own a Bulk Reef Supply 4-Stage RO/DI unit, this kit is a straightforward way to address the problem without replacing the whole system. It targets the two stages that matter most for chloramine handling and adds a second DI stage that gives you a wider window before maintenance becomes urgent.

Consider it a priority purchase if you have seen DI resin discolour unusually fast or if you want to protect membrane life before it becomes an expensive problem. If your water is treated with chlorine instead, or your system is not one of the compatible 4-Stage units, spend the money elsewhere in the tank first.

Conclusion

The Bulk Reef Supply Value to Deluxe RO/DI Upgrade Kit is a focused, purpose-built upgrade: an extra universal carbon block where chloramines need to be intercepted, and a second DI chamber where a bit of protection goes a long way. For reef keepers on chloramine-treated city water with a compatible 4-Stage system, it is a practical and relatively contained fix rather than a full rebuild.