Reverse Osmosis Tanks

What Is a Reverse Osmosis Tank and Why Is It Essential for Clean Water?

A reverse osmosis (RO) tank is a pressure-regulated reservoir essential to RO water filtration systems, designed to store purified water and deliver it on demand. Due to the slow nature of the RO process, these tanks ensure immediate access to clean water while maintaining system pressure and efficiency. Constructed from durable materials like steel or fibreglass with an inert lining and a diaphragm, RO tanks protect water quality and prevent contamination. Their primary functions are to store filtered water and regulate pressure, thereby enhancing system longevity and reducing waste.

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Excelflow Reverse Osmosis RO Storage/Pressure Tanks

The Excelflow Reverse Osmosis RO Storage/Pressure Tanks are OEM components designed for Vectapure reverse osmosis systems, offering reliable performance in compact spaces. Available in 3.2 and 4-gallon models, both tanks feature a 1/4" male NPT connection, 304 stainless steel inlets, and a factory precharge of 5–7 PSI. With a maximum working pressure of 100 PSI and operating temperature of up to 65°C (150°F), they are built for durability. The slimmer 3.2-gallon tank is ideal for tight spaces like kitchen cupboards or between ceiling joists, with actual capacities of 1.74 and 2.31 gallons, respectively.

FAQs

1. Why does my reverse osmosis tank feel full, but no water comes out?

If your RO tank feels heavy or full but little to no water flows from the faucet, the issue is often due to low internal air pressure or a faulty tank bladder. Inside the tank is an air chamber that helps push water out, and if this pressure drops below 5–7 psi when the tank is empty, water won't flow properly. Re-pressurizing the tank or replacing it may solve the issue.

2. How often should I replace my reverse osmosis tank?

An RO tank typically lasts between 5 to 10 years, depending on usage and water quality. Over time, the bladder inside can degrade, causing reduced water flow or inability to hold pressure. Regular maintenance and checking for internal air pressure can extend its lifespan, but once performance declines significantly, replacement is often more cost-effective than repair.

3. Can a reverse osmosis tank become contaminated?

Yes, while RO tanks are sealed systems, contamination can occur if the tank is improperly sanitized or the bladder becomes compromised. Mould, bacteria, or biofilm may develop over time, especially if the tank hasn't been cleaned during filter changes. Sanitizing the system annually when changing filters helps prevent contamination.

4. Is it safe to drink water that’s been sitting in a reverse osmosis tank for days?

Generally, RO water stored in a tank for a few days is still safe, as the system is pressurized and closed to contaminants. However, if the system hasn’t been used for a week or more, it’s a good idea to flush the tank once before drinking to ensure the freshest water possible.

5. What is the ideal pressure for a reverse osmosis storage tank?

The ideal pressure for an empty RO tank is between 6–8 psi. This pre-charge pressure helps the system push water to the faucet. If the pressure is too low, flow decreases; if too high, the tank may not fill properly. You can check it using a tire pressure gauge after draining all the water from the tank.