Wash water systems play an important role in photographic film processing used in Non-Destructive Testing (NDT). These systems remove residual processing chemicals and support stable operating conditions in photographic film processors used for industrial inspection.

Over time, biological growth such as biofilm, bioslime or algae may develop in wash water tanks and circulation systems. These deposits may influence wash water quality and increase maintenance requirements in film processors.

This guide explains how wash water systems operate, which challenges may occur in NDT film processors, and how maintenance practices and treatment solutions may help support stable system performance.

Photographic film processing used in NDT inspection generally consists of several stages:

1. Development
2. Fixing
3. Washing
4. Drying

The washing stage removes residual processing chemicals from the film surface after development and fixation. Proper washing helps ensure that inspection films remain clean and stable before drying.

Typical wash water systems used in photographic film processors include:

• wash water tanks
• circulation pumps
• hoses and piping systems
• overflow systems
• water supply connections

These components work together to maintain stable wash water conditions during the film processing cycle.

More information about the use of wash water systems in industrial inspection environments can be found on the Applications for NDT film processing page.

Because water is continuously present in wash water tanks and circulation systems, these environments may create conditions where micro-organisms develop over time.

Biological deposits may include the formation of:

• biofilm
• bioslime
• algae growth

These deposits may form on internal surfaces such as tank walls, pumps, rollers and circulation hoses used in film processors.

Over time, biological buildup may influence wash water conditions and increase cleaning and maintenance requirements.

Biofilm is a biological layer formed when micro-organisms attach to surfaces in water systems. Once established, biofilm may gradually expand across surfaces inside wash water tanks and circulation systems.

In photographic film processors, biofilm may develop on:

• tank walls
• circulation hoses
• rollers
• pumps
• water circulation components

Bioslime is a visible deposit that may appear when biological growth accumulates in wash water systems.

Regular inspection and maintenance of wash water systems may help operators manage these conditions.

Several operational challenges may develop in wash water systems used in film processors.

Typical issues may include:

• biofilm deposits forming inside wash water tanks
• algae growth affecting water clarity
• reduced circulation caused by deposits in hoses or pumps
• increased cleaning and maintenance requirements

Regular inspection of wash water tanks and circulation systems helps detect potential problems early and supports stable operation of film processors.

Regular maintenance helps support stable wash water conditions in film processors used in NDT inspection environments.

Typical maintenance activities include:

• inspection of wash water tanks
• cleaning circulation systems
• monitoring water quality
• checking pumps and hoses
• controlled dosing of treatment products

Preventive maintenance helps reduce the risk of operational interruptions.

During maintenance procedures, cleaning products may be used to remove biological deposits from wash water tanks and circulation systems. See the VLOSEPT wash water cleaning product for more information.

In many installations, treatment products are applied to wash water systems to help maintain stable conditions over time.

Treatment products may assist operators in managing biological growth in wash water systems used in photographic film processors.

One example is the VLOCLEAR wash water treatment product designed for photographic film processors used in NDT inspection.

These products are often applied using precision dosing dispensers for wash water systems, allowing treatment products to be introduced at controlled intervals.

Automated dosing helps maintain consistent treatment routines and reduces manual dosing operations.

Products designed to support wash water systems used in NDT film processing environments include:

VLOCLEAR
Treatment product designed to support management of biological growth in wash water systems.

VLOSEPT
Cleaning product used during maintenance and disinfection of wash water tanks and circulation systems.

Precision dosing equipment
Dosing dispensers designed for controlled application of treatment products.

Learn more about these precision dosing dispensers for wash water systems on the product pages.

Film-based NDT inspection remains important in industries where reliable inspection processes are required for safety and quality assurance.

Examples include:

• aerospace inspection
• nuclear industry
• naval shipbuilding
• construction and infrastructure
• industrial manufacturing

Maintaining stable inspection processes supports operational continuity and product integrity in these environments.

Technical documentation for SAMA Water Products solutions is available in the technical documentation and SDS section of this website.

Available documents include:

• Safety Data Sheets (SDS)
  • VLOCLEAR
  • VLOSEPT
• Installation manuals
• EU Declarations of Conformity
• Technical product documentation