Cleaning and rinsing of IBC containers between different uses: washing water, irrigation water, liquid fertiliser and preservative

Cleaning and rinsing of IBC containers This is a critical procedure whenever the same tank is switched from wash water to irrigation water, liquid fertiliser or preservative. The correct method reduces cross-contamination, odours and blockages, and extends the service life of valves and seals. This practical guide explains which parts to rinse, what equipment to use and how to minimise residues, both on the farm and in property maintenance.

Lootu Oy (Kempele, Pekurinpolku 3, 90450) manufactures sturdy IBC container racks for tractors and wheel loaders. When transporting several liquids on the same chassis, the rack’s secure mounting also makes cleaning easier: the container remains securely in place and can be emptied safely. If you use a single IBC system for multiple jobs in the Oulu region, Vaasa, Joensuu, Kuopio or neighbouring municipalities (Liminka, Tyrnävä, Raahe), it is worth standardising your maintenance routine.

Cleaning and rinsing IBC containers: risks and basic principles

When switching from a “mild” liquid (e.g. washing-up water or watering water) to “demanding” (liquid fertiliser or preservative) – or vice versa – the main risk is residue: just a few decilitres of old liquid can alter the composition, odour or safety of the next batch. A particularly sensitive combination is alternating between a preservative and irrigation water: acidic substances can leave behind odours and corrosive residues, and, conversely, organic debris can compromise the controlled dosing of the preservative.

A good rule of thumb is always to work “from the inside out”: first remove as much of the old fluid as possible, then flush the tank, and finally flush the parts where fluid is most likely to remain (valve, outlet, hose, fittings and any filter). Simply filling and emptying the tank is not enough if deposits remain on the valve body or if a pocket of the previous fluid remains in the hose.

If you need some background on the various uses of the IBC in everyday life, please also see our in-house guide: An IBC container on a farm: a versatile solution. It helps to determine when it makes sense to use a separate container for each liquid and when thorough cleaning makes it possible to use a single container.

Flushing the valve, as shown in the picture, is often the most effective “small step”: it reduces residue precisely at the point where the next flow of liquid begins. When flushing is carried out at a gentle flow rate, sediment and crystallisations are also dislodged more effectively than with a rapid “full-flow” drain.

The best way to minimise odour problems is to always rinse the hoses and connectors as well – not just the tank. Residues usually build up in small dead spaces.

Tools and cleaning products: what to use for cleaning and rinsing IBC containers

The basic kit is surprisingly small, provided you choose the right items. You’ll need clean water (preferably under pressure), a brush or a long-handled washing head, and a container or canister for the initial rinse water. It’s also a good idea to have separate hoses or, at the very least, clearly labelled connectors for “clean” water and “chemicals” if you’re using the same rack system for, say, liquid fertilisers and preservatives.

When choosing a cleaning agent, compatibility is key: the inner tank of an IBC container is usually made of HDPE plastic, but the seals and valve parts may be made of different materials. When dealing with preservatives and fertilisers, it is advisable to follow the manufacturer’s instructions and, wherever possible, clean using a “mechanical method with plenty of water”. For general information on the risks of mixing chemicals, you can read, for example, Wikipedia: Chemical - from the article; in practice, the most important thing on a farm is to avoid unfamiliar combinations and to carry out the rotation in a controlled manner.

It is good practice to treat “rinsing water” as a separate process: the first flush removes most of the residue, the second flush ensures the final result, and the third (if necessary) is a brief “check” through the valve. When the work is always carried out in the same way, it also makes staff induction easier.

Step by step: washing water, watering water, liquid fertiliser and preservative

There is no single cleaning programme that applies to all liquids, but you can devise one based on risk assessment. Switching from washing water to irrigation water is often the easiest option, provided that no detergent residues reach the plants. When switching from irrigation water to liquid fertiliser, the most important thing is to ensure that no organic dirt or sand remains in the tank, as this can block the dispenser or valve. When using a preservative, the focus is on safety, splash control and minimising odours.

The table below sets out a practical “minimum recommendation” level. If the work involves frequent contracting, it is advisable to adopt this recommendation as standard. If, on the other hand, use is occasional, meeting at least the minimum level will prevent the most common errors.

In practice, efficiency comes down to two things: (1) emptying the container in the correct position and allowing it to “drain completely” for a sufficient length of time, and (2) always rinsing the outlet and the hose as well. If the IBC is mounted on a rack on a tractor or wheel loader, maintaining a safe position and controlled draining is easier – provided the fastenings and locks are secure. A useful internal checklist on this subject can be found here: How do you attach an IBC container to a rack correctly?

Once the IBC container is securely positioned on the rack, it can be rinsed in a controlled manner even in the yard: a collection container can be placed beneath the valve and the hose routing remains tidy. This reduces splashing and saves time when moving from one job to another during the same day.

Minimising odour nuisance and residues: valves, hoses and seals

Odour problems do not usually stem from the “large volume” of the tank itself, but from small surfaces: seals, the collar of the cap, the outside of the valve and the inside surface of the hose. It is therefore advisable to distinguish between two tasks: flushing the inside of the tank and flushing the fittings. For the fittings, the quickest method is to carry out a “flush-through”: let clean water flow through the hose, connector and valve so that the dead space is also flushed out.

Take care with the seals. If a seal swells, hardens or starts to smell permanently, it may allow micro-particles to pass through and make the next cleaning more difficult. Also avoid using brushes that are too stiff on the valve’s sealing surfaces. If you notice recurring leaks or find the connections difficult to make, the problem is not always “dirt” but a worn seal or an incorrect connector combination.

If you use the same equipment for cleaning in property maintenance and for handling chemicals on the farm, consider having clearly separate “water-side” and “chemical-side” equipment: for example, a separate hose, a separate dispenser and separate quick-connect couplings. Many problems can be solved simply by not trying to wash everything “in one go”, but by keeping high-risk items separate.

Labelling, record-keeping and storage: a checklist to prevent errors

A good cleaning process often falls down because nobody knows what was last in the container. That is why labelling and a simple “container log” are essential for day-to-day risk management. This is particularly important if the same IBC is used by several people, or if the equipment is moved to work sites in the Oulu and Kempele areas, or even to Vaasa and Kokkola for contract work.

It’s a good idea to be practical with your labelling: mark a clear spot on the side of the container and on the rack where you can attach a replaceable card or a weatherproof sticker (last liquid used, date, person responsible, “rinsed yes/no”). When storing the container, the most important thing is to keep the valve and cap protected from dirt and UV exposure, and to prevent freezing if the container is left outside. You can find further guidance for the winter season here: A combination of a rack and an IBC container for winter storage.

Clear labelling is a cost-effective safeguard: it prevents the wrong fluid from being filled, speeds up induction training and makes the quality of cleaning measurable. When combined with a simple checklist, this ensures that the work remains consistent even when things get busy.

Finally: if versatility is part of your daily routine, make cleaning a “system” rather than a one-off task. Lootu Oy’s IBC container racks are designed for practical use – when the container is handled safely, emptying, rinsing and storage can also be carried out in a more controlled manner. And once the process has been standardised, switching between washing water, irrigation water, liquid fertiliser and preservative can be done without unnecessary downtime.