What Remineralization Does
Reverse osmosis removes minerals along with contaminants. The 0.001-micron membrane that blocks lead, fluoride, and arsenic also strips out calcium, magnesium, potassium, and other dissolved minerals. The result is chemically pure but mineral-free water with a slightly acidic pH of 5.5-6.5.
A remineralization stage is the final filter in your RO system. After the membrane purifies the water, it passes through a cartridge containing calcium carbonate, magnesium oxide, and sometimes potassium carbonate. These minerals dissolve into the pure water, adding back the healthy minerals that the RO membrane removed.
Here is what happens to your water at each stage:
| Water Quality | Without Remineralization | With Remineralization |
|---|---|---|
| pH level | 5.5-6.5 (slightly acidic) | 7.0-7.5 (neutral to slightly alkaline) |
| Taste | Flat, slightly sour | Crisp, refreshing |
| Calcium | 0-5 mg/L | 15-30 mg/L |
| Magnesium | 0-2 mg/L | 5-15 mg/L |
| Corrosiveness | Slightly corrosive | Neutral — no corrosion |
| Annual cost | Included in standard maintenance | +$15-25/year |
Benefits for Orlando Homes
For Orlando families, remineralization provides several practical benefits:
Taste improvement: The single biggest benefit is taste. RO water without minerals tastes flat and slightly sour because the dissolved minerals that give water its characteristic taste have been removed. Adding calcium and magnesium back restores the familiar, crisp taste of good drinking water. This is the #1 reason homeowners add remineralization.
pH balance: RO water at pH 5.5-6.5 is slightly acidic. While safe to drink, it can slowly corrode copper and brass plumbing over many years. Remineralization raises pH to 7.0-7.5, neutralizing the water and protecting your plumbing. For newer Orlando homes with PVC or PEX plumbing, pH is not a concern — the taste improvement is the main benefit.
Mineral content: While you get most of your minerals from food, the small amount of calcium and magnesium in remineralized RO water does contribute to daily intake. A glass of remineralized RO water provides 15-30 mg of calcium and 5-15 mg of magnesium — small amounts that add up over a day.
Coffee and tea quality: Mineral content significantly affects coffee and tea extraction. RO water without minerals extracts poorly from coffee beans and tea leaves, resulting in flat, under-extracted beverages. Remineralized RO water produces noticeably better coffee and tea — a small benefit that coffee and tea lovers appreciate daily.
Does Your System Need Remineralization?
Whether remineralization is right for your Orlando home depends on your priorities:
You should add remineralization if:
- You drink RO water daily and notice flat or sour taste
- You have copper or brass plumbing and want to reduce corrosiveness
- You make coffee or tea regularly and want better extraction
- You are concerned about pH balance for long-term health
- You want the best-tasting drinking water possible
You can skip remineralization if:
- You use RO water primarily for cooking (not drinking straight)
- You have PVC or PEX plumbing (no corrosion concern)
- Budget is tight and every dollar matters
- You do not notice the taste difference
Bottom line: Remineralization adds calcium and magnesium back into RO water, raising pH from 5.5-6.5 to 7.0-7.5 and dramatically improving taste. It costs $15-25/year for cartridge replacement and is compatible with virtually any RO system. For Orlando families who drink RO water daily, remineralization is one of the best $15/year improvements you can make — the taste difference is immediately noticeable.
Installing a Remineralization Cartridge
Adding remineralization to an existing RO system is a simple DIY project:
What you need:
- Remineralization cartridge ($15-25)
- Adjustable wrench or filter wrench (usually included with RO system)
- Rag or bucket (for minor water spillage)
Installation steps:
- Shut off the RO water supply valve.
- Open the RO faucet to release tank pressure.
- Locate the post-carbon filter housing (usually the last filter before the faucet).
- Unscrew the filter housing cap and remove the post-carbon filter.
- Insert the remineralization cartridge in the same orientation.
- Replace the housing cap and hand-tighten.
- Turn water supply back on.
- Flush the system for 15 minutes with the faucet open.
Installation takes 15-30 minutes and requires no special tools. The cartridge is replaced annually during your normal filter change cycle.
Bottom line: Adding a remineralization cartridge to your RO system costs $15-25 and takes 15-30 minutes to install. The benefits are immediate: noticeably better-tasting water, improved pH (7.0-7.5), and added healthy minerals. For Orlando families drinking RO water daily, remineralization is one of the best $15 improvements you can make. Install it yourself or have a technician add it during your next service visit.
Types of Remineralization Cartridges
Not all remineralization cartridges are the same. Calcium carbonate only cartridges ($15-20) raise pH and add calcium. Calcium plus magnesium oxide cartridges ($20-25) provide a more complete mineral profile and better taste. Premium formulas with calcium, magnesium, and potassium ($25-30) offer the best taste improvement. Alkaline mineral blends ($30-40) raise pH to 7.5-8.0 for those who want alkaline water without buying bottled. For most Orlando homeowners, the calcium plus magnesium oxide cartridge at $20-25 provides the best balance of taste, pH improvement, and value.
What does a remineralization stage do in an RO system?
A remineralization stage adds healthy minerals (calcium, magnesium, potassium) back into RO-purified water after the membrane removes them. It raises pH from 5.5-6.5 to 7.0-7.5, improves taste, and reduces the corrosiveness of RO water to copper plumbing. The cartridge typically contains calcium carbonate and magnesium oxide.
Is remineralization necessary for an RO system?
Remineralization is not strictly necessary for safe drinking water — RO water without remineralization is perfectly safe. However, it significantly improves taste, pH balance, and plumbing compatibility. For Orlando families drinking RO water daily, remineralization is worth the $15-25 annual cartridge cost.
How much do remineralization cartridges cost?
Remineralization cartridges cost $15-25 and are replaced annually during your normal filter change cycle. For $15-25 per year, you get better taste, improved pH, and added minerals. Compared to bottled alkaline water ($2-4 per gallon), the savings are enormous for daily drinkers.
Does remineralization reduce RO contaminant removal?
No. The remineralization stage is installed AFTER the RO membrane in the filtration sequence. It has zero effect on contaminant removal. All 95-99% of contaminants are removed by the membrane before water reaches the remineralization cartridge. The minerals are added to already-pure water.
Can I add remineralization to my existing RO system?
Yes, most standard RO systems can accommodate an additional remineralization stage. A 4-stage system can become a 5-stage system with remineralization. The cartridge fits in-line between the post-carbon filter and the RO faucet. Installation takes 15-30 minutes and requires no special tools.