Skip to content
5.0 out of 5 (1 review)
my unit is working as good as new now— Albert Rogers
18 Litre Reverse Osmosis Reservoir Tank
MPN
£64.99 inc. VAT
Out of stock
Choose another option
For Reverse Osmosis
- 18 L capacity
Calculating delivery...
FREE Express Delivery
UK orders over £60
Next Day Delivery
£6.99
Standard Delivery
£3.99 for 2-3 days
*Applies when Next Day Delivery is selected at checkout.
Delivery information
Order before the delivery cut-off for the fastest available dispatch. Delivery options and final prices are confirmed at checkout.
Need help choosing the right fitting?
Our size guide and fitting advice help you choose the right connection first time.
View Size Guide
The Filter Flair Correct Fit Promise
Not sure which fitting you need? Our experts are here to help you choose the right size and fitting for your system.
Learn moreWhat our customers say
The 18 Litre Reverse Osmosis Reservoir Tank is the perfect addition to any RO system, providing up to 12 litres of RO water on demand.
Made from stainless steel with an inner membrane made from butyl rubber.
Specifications
Maximum Working Pressure: 100PSI
Nominal Capacity: 18 litres
Actual Capacity: Approx. 12 Litres (3.2 US Gallons)
Actual Useable Capacity: Approx. 10.6 litres (2.8 US Gallons)
Connection: 1/4" NPT
All Tanks are pre-charged at 7 PSI.
- MPN
- RORES18
- Brand
- Filter Flair
- Application
- Reverse Osmosis
- Fitting type
- Ro tank
- Material
- Stainless Steel/Butyl
- Capacity
- 18 litres
Follow the manufacturer’s installation guidance and check all connections before leaving the installation.
Order before our dispatch cut-off — 3pm Monday to Friday, or 12pm on Saturday — and your order is sent the same day; anything after that follows the next working day. We don’t dispatch on Sundays, and you’ll get a tracking link by email as soon as your order is on its way.
Choose your UK delivery option at checkout:
- Free Express Delivery — free on orders over £60 (2–3 working days).
- Standard Delivery — £3.99 (2–3 working days).
- Next Day Delivery — £6.99, arriving the next working day when you order before the cut-off.
We also ship internationally, with rates calculated at checkout.
Returns & refunds
Changed your mind? You have 30 days to return any unused filter in its original sealed packaging for a refund, or 90 days for exchanges. Start at our returns portal and either generate a prepaid Royal Mail label (£3.49, deducted from your refund) or use your own courier — exchanges are always free to return. We approve refunds within 24 hours of your return reaching us; your bank may then take 3–5 working days to show the funds.
Product Details
The 18 Litre Reverse Osmosis Reservoir Tank is the perfect addition to any RO system, providing up to 12 litres of RO water on demand.
Made from stainless steel with an inner membrane made from butyl rubber.
Specifications
Maximum Working Pressure: 100PSI
Nominal Capacity: 18 litres
Actual Capacity: Approx. 12 Litres (3.2 US Gallons)
Actual Useable Capacity: Approx. 10.6 litres (2.8 US Gallons)
Connection: 1/4" NPT
All Tanks are pre-charged at 7 PSI.
Specifications
- MPN
- RORES18
- Brand
- Filter Flair
- Application
- Reverse Osmosis
- Fitting type
- Ro tank
- Material
- Stainless Steel/Butyl
- Capacity
- 18 litres
Installation
Follow the manufacturer’s installation guidance and check all connections before leaving the installation.
Delivery & Returns
Order before our dispatch cut-off — 3pm Monday to Friday, or 12pm on Saturday — and your order is sent the same day; anything after that follows the next working day. We don’t dispatch on Sundays, and you’ll get a tracking link by email as soon as your order is on its way.
Choose your UK delivery option at checkout:
- Free Express Delivery — free on orders over £60 (2–3 working days).
- Standard Delivery — £3.99 (2–3 working days).
- Next Day Delivery — £6.99, arriving the next working day when you order before the cut-off.
We also ship internationally, with rates calculated at checkout.
Returns & refunds
Changed your mind? You have 30 days to return any unused filter in its original sealed packaging for a refund, or 90 days for exchanges. Start at our returns portal and either generate a prepaid Royal Mail label (£3.49, deducted from your refund) or use your own courier — exchanges are always free to return. We approve refunds within 24 hours of your return reaching us; your bank may then take 3–5 working days to show the funds.