Aqualine Flex Tanks - Collapsible Reservoir for Grow Rooms and Rainwater
Best for: growers who need extra reservoir capacity for a hydroponic system or rainwater collection, but don't have room to store a bulky rigid tank when it's not in use.
Our thoughts
This is a tank, not a feed - simple as that. It folds flat when empty and stands up as a proper reservoir once the poles and taps are fitted, which makes it a genuinely useful bit of kit for anyone short on space around the grow room. No feeding schedule required, just water in one end and out the other.
Aqualine Flex Tanks are collapsible water reservoirs made from a durable, flexible liner supported by internal poles that slot into sleeves sewn into the tank walls. Unlike a rigid water butt or IBC tank, they pack down flat for storage or transport and only take a couple of minutes to assemble - fit the poles, insert the tap, and it's ready to fill. Once assembled they hold their shape and function like any standard reservoir, whether that's feeding a flood and drain table, a DWC system, or gravity-fed drippers.
They're supplied in a range of sizes so you can match tank capacity to the space you've got and the number of plants you're feeding, from a single small tent up to a larger multi-tank room.
How it compares
Flex Tanks sit in the same category as AutoPot's own FlexiTank range, which uses the same collapsible design principle.
- Same core mechanism as the AutoPot FlexiTank - a pole-and-sleeve flexible liner that packs flat when empty.
- Takes up far less storage space than a rigid water butt or IBC tank of equivalent capacity when not in use.
- Assembly takes minutes with no tools required, compared with the more involved setup of a permanent rigid reservoir.
If you need a reservoir that's rarely moved and space isn't an issue, a rigid tank can be more durable long-term - but for anyone who needs to store it away, transport it, or fit it into an awkward space, the flexible design is the practical choice.
Usage guidance
Setup is quick, but a few basics keep it running well.
Assembly
Unfold the liner, slot the support poles into the sewn sleeves around the top edge, then fit the tap and any fittings before filling with water.
Positioning
Set it up on a flat, level, debris-free surface before filling - once full, a larger tank is heavy and difficult to reposition.
Connecting to a system
Fit the tap or bulkhead connector to run feed lines out to your irrigation system, whether that's a gravity-fed drip setup, a flood table pump, or an AutoPot-style layout.
Off-season storage
Empty, rinse and fully dry the liner before folding it flat for storage between grows.
Technical specifications
- Format: Collapsible flexible-liner reservoir
- Sizes available: 100L, 250L, 500L, 750L
- Assembly: Support poles + sewn sleeves, tap fitting, no tools required
- Assembly time: Around 2-3 minutes
- Storage: Packs flat when empty and dry
- Compatible with: Flood and drain, DWC, gravity-fed drip, and general water/rainwater storage
- Brand: Aqualine
Who this is for
- Growers with limited space who need a large reservoir but nowhere to permanently store a rigid tank.
- Anyone running a flood and drain, DWC or gravity-fed system who needs extra nutrient solution capacity.
- Growers collecting rainwater for irrigation who want a low-cost, easy-to-store storage option.
- Multi-tent setups where several tanks need to be moved or reconfigured between grows.
Best suited to anyone who values flexibility and storage space over a permanently fixed rigid tank.
Our take
It does one job - hold a lot of water or nutrient solution in a space-efficient way - and does it without fuss. The pole-and-sleeve design is proven (it's the same principle behind AutoPot's own FlexiTank range), and having it available in sizes from 100L up to 750L means you can match capacity to your room rather than overbuying.
If storage space is at a premium and a rigid tank isn't practical, this is the sensible alternative, at a price that makes sense.
