How to dose laundry detergent correctly (and why most people get it wrong)
Here's something the adverts will never tell you: most people use 1,5-2 times more laundry detergent than they need. It's not just a waste of money — it leads to poorer washing results, damaged clothes and potential skin irritation. In this article we explain why this happens, how to work out the right dose based on water hardness in Lithuania and how dirty your laundry is, and how to tell if you're currently using too much.
Why so many people get the dose wrong
There are three reasons why most people overdose:
1. The "more = cleaner" myth
It seems logical: if your clothes are very dirty, add more detergent. But laundry chemistry works differently. Up to a certain point — yes, more detergent = better results. Beyond that point — more detergent = worse results, because the fibres don't rinse out fully and the residue coats the fabric in a "softening" layer that actually just clogs it.
2. Marketing
Detergent manufacturers have an interest in you using more, not less — so that you buy more. Labels often show "recommended" doses that are more generous than necessary.
3. Standard measuring caps
Most detergent caps hold 60-100 ml. People instinctively pour a "full" or "half" cap — when in reality a third of a cap is often enough.
The consequences of overdosing
Residue in the fibres
Detergent that doesn't rinse out stays in the fibres. This residue:
- Stays in contact with your skin all day — it can cause irritation, especially for children and people with sensitive skin
- Stops the fibres from "breathing"
- Attracts more dirt (ironically)
- Smells stronger than it should
Damage to clothes
Excessive concentrations of surfactants damage the fibre structure. Clothes wear thin more quickly and colours fade faster.
Limescale in the washing machine
Too much detergent combined with hard water creates residue in the drum and pipes of the washing machine. Over time, it needs professional cleaning.
Money down the drain
Literally. If you use 2x more than you need, your detergent will run out 2x faster. That doubles your annual spend.
3 factors that determine the right dose
The right dose isn't a fixed number — it depends on three things:
1. Load size (kg)
A standard washing machine holds 5-7 kg of dry laundry. Your loads are often smaller (3-5 kg). The dose should be proportionate: not a full dose if the drum isn't full.
2. Soiling level
- Light: everyday T-shirts, underwear, trousers without stains
- Medium: bedding, sportswear, children's clothes with minor stains
- Heavy: workwear, kitchen cloths, sportswear after an intense workout
- Very heavy: painters' work clothes, builders' clothing, set-in stains
3. Water hardness
Hard water (high in calcium and magnesium) requires more detergent, because some of the surfactants "bind" to the minerals instead of cleaning your clothes. In Lithuania, water hardness varies considerably by region.
Water hardness in Lithuania
In general, Lithuanian water is moderately hard to hard, with regional differences. Approximate values (in German degrees, °dH):
- Vilnius: ~10–14 °dH (moderately hard)
- Kaunas: ~12–16 °dH (hard)
- Klaipėda: ~6–10 °dH (medium)
- Šiauliai: ~10–15 °dH (moderately hard)
- Panevėžys: ~12–17 °dH (hard)
You can check the water hardness where you live on your water supplier's website, or test it at home with a water hardness test kit (~5–10 € in shops).
General dosing rule by water hardness:
- Soft water (0–7 °dH) — reduce the dose by 20–30%
- Medium (8–14 °dH) — standard dose
- Hard (15–21 °dH) — increase the dose by 10–20%
- Very hard (22+ °dH) — consider a water softening system
Practical dosing guide
For liquid enzyme laundry detergents (such as Ecozyme):
| Situation | Dose |
|---|---|
| Light soiling, medium water, 4 kg of laundry | 20-25 ml |
| Medium soiling, medium water, 5 kg | 30-35 ml |
| Heavy soiling, medium water, 5 kg | 40-50 ml |
| Very heavy soiling + hard water, 6 kg | 50-60 ml |
| With pre-treatment on the stain | 10-15 ml on the stain + standard dose in the machine |
At first it may seem like too little. But give it a try — you'll find the results are no worse, and often better (clothes feel "cleaner" because they rinse out more thoroughly).
What to do if you have hard water
- Water softener (limescale binder) — add it to the pre-wash compartment or buy dedicated products (e.g. Calgon)
- Bicarbonate of soda — 1 tablespoon in the pre-wash compartment raises the pH and binds minerals
- Pre-rinse cycle — most modern washing machines have one; it helps flush out minerals before the main wash
- Lower temperature — in hard water, high temperatures speed up limescale formation
More on the question of temperature — in our article on low-temperature washing.
What to do if you have soft water
Water in the Klaipėda district and from some artesian sources is soft. In that case:
- Reduce the dose by 20-30%
- Watch the amount of foam — if you see too much foam during the extra rinse, that's a sign to cut back further
- Clothes should feel light, not stiff
Ecozyme dosing specifics
Ecozyme enzyme laundry detergent has a specific dosing scale:
- Standard wash: 30 ml (medium soiling, medium water)
- Range: 30-60 ml depending on soiling and water hardness
- Pre-treatment: an extra 10-15 ml directly on the stain
- A 1000 ml pack lasts up to 33 washes at a 30 ml dose
A practical cost calculation: 14,90 € ÷ 33 washes = ~0,45 € per wash. If you use 60 ml (double), the cost per wash doubles.
How to tell if you're using too much
5 signs to look out for:
- Clothes feel stiff after washing — residue is coating the fibres
- Lots of foam during the main wash — a correctly dosed detergent produces little foam, which settles quickly
- The second (extra) rinse still foams — a clear sign of overdosing
- The scent on your clothes is too strong — a correctly dosed detergent leaves a gentle scent, not an overpowering one
- Clothes wear thin faster than expected — a long-term sign of overdosing
Frequently asked questions
Does a smaller dose mean a less thorough wash?
No, as long as the dose is still appropriate for the level of soiling. For most everyday washes, 25-30 ml of enzyme laundry detergent is plenty. A smaller dose means better rinsing, not less cleanliness.
How is concentrated detergent dosed differently?
Concentrated detergents are dosed at 2-3x less than regular ones. Always follow the label instructions, not habit.
Does the "half a cap" rule work?
Only as a rough estimate. A more accurate approach is a measuring scale or precise measurement with the dosing cap. On most caps, "half" is about 30-40 ml.
Do I need to use more if I wash in cold water?
No. Enzyme laundry detergent is designed specifically to work at low temperatures, so the standard dose is fine. Increasing the dose won't improve the result proportionately.
How do I know if I've dosed correctly?
Your clothes should: smell gentle (not strong), feel soft (not stiff) and leave no residue on your skin. If everything seems fine — your dosing is right.
Summary
The secret to correct dosing is simple: less than you think. For most everyday washes, 20-30 ml of enzyme laundry detergent is enough. Harder water, tougher stains — use more. Softer water, light soiling — use less. Remember the three signs of overdosing: stiff clothes, lots of foam, a strong scent. Start by reducing your dose by 5 ml at a time and see whether the results get worse. Most likely they won't — and over a year you'll save 30-50% on detergent costs.
Read more about the detergent itself in our pillar article on enzyme laundry detergent.
