Targeted water quality treatment for growing

Introduction

Not only how much you water, but also what exactly you water influences the health of the root zone. Many irrigation problems are not caused by the watering technique itself, but by unsuitable water: very hard tap water, suspended solids, disinfectants or highly fluctuating initial values. This guide focuses exclusively on the preparation and assessment of irrigation water before use.

Why water quality is important when watering

Watering water is more than just moisture. It always brings dissolved substances into the root zone. These include, among other things:

• Calcium and magnesium from hard water
• Hydrogen carbonates, which can buffer the pH value upwards
• Chlorine or chloramine for drinking water disinfection
• Sediments, rust particles or organic residues from pipes and tanks

If these factors are not taken into account, the watering behavior may be correct, but the irrigation still works poorly. Typical consequences are

• Unstable pH values in the irrigation water
• Salt and mineral deposits in the substrate or on drippers
• uneven water flow in automatic systems
• unnecessary stress on the root zone

Assess the water source correctly

Tap water

Tap water is the standard source for many hobby breeders. It is usually hygienically safe, but can vary greatly from region to region. The most important factors are

• total hardness
• hydrogen carbonate/carbonate hardness
• Possible additives such as chlorine or chloramine

It makes sense to take a look at the water analysis of the local supplier. This data is often available online. This is particularly important if you repeatedly observe white residues, high pH stability upwards or encrusted irrigation technology.

Rainwater

Rainwater is often soft and low in minerals. This can be beneficial, but only if it is cleanly collected and stored. The following are problematic:

• Dirt from the roof
• organic inputs
• Stagnant water in warm containers

For direct use, rainwater should be clear, odorless and free of visible particles. Clean, light-protected containers are important for longer storage periods.

Recognize and correctly classify hardness

Hard water is not an automatic exclusion criterion, but it does require more attention. High hardness usually means more dissolved minerals, especially calcium and magnesium. In addition, the carbonate hardness is often increased, which can push the pH value of the irrigation water upwards.

Pay attention to these indications:

• White limescale edges on watering cans or tanks
• Deposits on drippers and hoses
• Kettles or containers calcify quickly
• pH value is difficult to lower and rises again

For a rough practical assessment:

• soft water: usually uncomplicated to treat
• medium water: often easy to use, but keep an eye on it
• hard water: check regularly and keep the technology clean

Distinguish between chlorine and chloramine

Misunderstandings often occur here. Free chlorine can partially escape by leaving the water open. Chloramine is much more stable and does not reliably disappear by simply leaving it standing.

The following therefore applies:

• Only if your supplier actually uses free chlorine can leaving it standing be helpful.
• For chloramine, you need a different solution, for example suitable filter technology such as activated carbon.

If you use automated irrigation, you should pay particular attention to this point, as constant water quality is important for a consistent supply.

Avoid sediment and particles

Even visually inconspicuous water can contain fine particles. These are particularly relevant for:

• Drip irrigation
• thin pipes
• small nozzles
• Water from barrels or open containers

Practical measures:

• Do not draw water from tanks directly from the sediment
• Rinse out tanks regularly
• Use pre-filters or sieve filters in automatic systems
• Check hoses and drippers at fixed intervals

This will prevent the amount of water dispensed from fluctuating unnoticed between individual plants.

Simple routine for water treatment

For manual watering

1. determine water source.
2. carry out a visual inspection: clear, odorless, no suspended particles.
3. check the supplier data for tap water.
4. filter or sediment the water if necessary.

5 Only then prepare the irrigation water further.

For automatic irrigation

1. add only clean, particle-free water to the tank.
2. insert filters upstream of the distributors.
3. keep the tank clean and free of light.
4. check drippers regularly for equal delivery rate.

Common faults

• Not checking the water quality at all and only paying attention to the watering quantity
• Using hard water for a long time without checking it
• Treating chlorine and chloramine in the same way
• Storing rainwater in dirty or warm containers
• Ignore sediment in the tank until drippers run unevenly

Conclusion

Good watering starts before the actual watering. If you know your water source, correctly classify hardness and disinfection additives and keep suspended solids out of the system, you create a much more stable basis for any further watering decisions. This makes watering quantities, drain control and moisture management truly reliable.

Pro Tips

• Check your supplier's water analysis at least once a year.
• White limescale edges are a practical indication of hard water.
• Leaving it open only helps with free chlorine, not with chloramine.
• Never take tank water directly from the sediment.
• Check drippers regularly for equal flow rate.