How to Clean an RO Water Storage Tank

Maintaining clean storage for reverse osmosis (RO) filtered water is essential for taste, safety, and system longevity. Regular cleaning helps prevent slimy buildup, algae growth, and mineral deposits that can affect performance. This guide covers a practical, step-by-step approach tailored for American households using common RO setups.

Following best practices ensures your stored RO water remains microbiologically safe and ready for use in drinking, cooking, and beverages. The process leverages specialized cleaning products and tools designed for RO systems, along with clear safety precautions.

Quick Answer

What to do fast: Use an RO water storage tank cleaning kit and RO membrane cleaning kit to remove organic residue and mineral buildup. Sanitize with an RO system sanitizer and cleaner, then rinse with a food grade sanitizing solution for water tanks. Sanitize regularly and store the tank open-air or covered per system guidelines to avoid recontamination.

What You’ll Need

RO water storage tank cleaning kit
RO system sanitizer and cleaner
Food grade sanitizing solution for water tanks
Storage tank cleaning brush for RO system
RO membrane cleaning kit

	APEC Water Systems Tank-4 4 Gallon Residential Pre-Pressurized Reverse Osmosis Water Storage Tank
	AQUA SHOCK H2O Fresh Water Tank SANITIZER/Disinfectant
	FS-TFC 5-Stage Reverse Osmosis Water Filtration System 100GPD Fast Flow Plus Extra 4 Filter for Free (FS-RO-100G-A)

Before You Start

Before initiating any cleaning, turn off the RO system and shut off incoming water supply. Drain the storage tank completely and disconnect power to any pumps if applicable. Wear protective gloves and eye protection during chemical handling. Do not mix cleaners unless explicitly instructed by the product label, and ensure ventilation in the work area. Plan for a cleaning window of 45–90 minutes, plus a final rinse period.

Step-By-Step: How To Clean The RO Water Storage Tank

Turn off the RO system and depressurize the tank by opening a faucet until flow stops.
Drain the tank completely and disconnect any hoses attached to the storage container.
Remove the tank lid and inspect for debris; use a storage tank cleaning brush for RO system to loosen residue on the interior walls.
Rinse the interior with clean, potable water to remove loose particles.
Prepare the RO system sanitizer and cleaner according to label directions and circulate it through the tank and brief RO lines to disinfect surfaces.
Let the cleaner sit for the recommended contact time, then drain the tank again.
Rinse thoroughly with clean water until all cleaner residues are gone. Reconnect lines and ensure the storage tank is empty while flushing the system.
Fill the tank with clean water and add a food grade sanitizing solution for water tanks if the product directions call for post-clean sanitization.
Run water through the system for several minutes to purge any residual sanitizer. Check for color or odor changes and confirm clear, neutral-tasting water before use.
Fully reassemble, re-pressurize, and run the faucet until a steady, clean stream is achieved. Sanitize any external surfaces touched during cleaning.
Document the cleaning date and schedule periodic maintenance every 6–12 months, or sooner if the water quality changes.

Troubleshooting

<tdInsufficient rinsing; lingering sanitizer

<tdResidual minerals or biofilm

<tdBlocked lines or partially clogged output

<tdImproper resealing or damaged gaskets

Symptom	Likely Cause	Fix
Water smellsMusty or Chlorine-like	Increase rinse duration; run system until odor diminishes	Follow exact product contact times; final rinse is essential
Tank water appears hazy	Run additional flush cycles; use RO membrane cleaning kit if specified	Regular cleaning schedule; avoid long storage without circulation
Low water pressure from faucet	Inspect fittings; flush lines; replace clogged components	Protect lines from contamination; use clean storage and fittings
Leak at tank lid or fittings	Replace seals; reseal all connections	Inspect hardware during cleaning; avoid overtightening

Common Mistakes

Using non-food-grade cleaners inside the reservoir
Rushing the rinse phase and leaving chemical residues
Forgetting to sanitize the tank cap and exterior surfaces
Not documenting the cleaning date for future reference

Proper use of the RO membrane cleaning kit and adherence to product instructions are essential to avoid damage to membranes or seals.

Tips For Best Results

Schedule cleaning after periods of inactivity or when taste or odor changes occur.
Use a dedicated brush designed for RO storage tanks to prevent scratches and harboring of microbes.
Keep the area clean and dry after rinsing to minimize recontamination.
Rotate sanitized water usage by keeping a small buffer supply for immediate consumption after cleaning.

Call A Professional

Consider contacting a professional if you notice persistent contaminants, persistent odors after sanitizing, leaks that cannot be fixed, or repeated failures of the cleaning cycle. Seek urgent help if there is visible mold, persistent biofilm, or any signs of system malfunction that could impact drinking water safety.

FAQ

How often should I clean an RO water storage tank?

A typical schedule is every 6–12 months, or sooner if water quality changes.

Can I use household cleaners to sanitize the tank?

Only if labeled as food-grade and compatible with RO systems; follow all product directions closely.

Is it safe to run hot water through the RO system during cleaning?

Hot water is generally not recommended for RO components; use cool, potable water unless specified otherwise.

What should I do if the water still tastes odd after cleaning?

Re-evaluate rinse times, check for hidden residues, and consider replacing or reconditioning the RO membrane if needed.

Can I reuse the same cleaning kit for future cleanings?

Yes, but replace any consumable parts per manufacturer guidelines and store kits in a clean, dry area.

Should I disinfect after every cleaning?

Disinfection with a food-grade sanitizing solution is recommended, followed by a thorough rinse.

What safety precautions are essential?

Wear gloves and eye protection, work in a ventilated area, and never mix cleaners unless directed by product labels.

Buying Guide

When selecting tools and consumables for RO water storage tank cleaning, consider size compatibility with your system, ease of use, and the quality of the sanitizing agents. Key buying factors include:

<bSize and fit: Ensure the cleaning kit and brushes match the tank dimensions and RO system layout.
<bNoise level: Pumps and cleaners should operate quietly during routine maintenance.
<bEnergy efficiency: Choose efficient cleaners that require minimal additional energy to circulate or flush water.
<bControls and chemical handling: Clear labeling, accurate dilutions, and safe storage features help prevent misuse.
<bPlacement and ease of access: Keep cleaning supplies near the RO system with proper ventilation.
<bCompatibility: Verify that the RO system sanitizer and cleaner, food grade sanitizing solution for water tanks, and RO membrane cleaning kit are compatible with your specific RO model.

Considering these factors helps ensure a straightforward cleaning process with reliable results. If in doubt, consult product manuals or a professional to confirm the best approach for your setup.