Buying a water-driven dosing pump is easier when you know what to ask. Before you order, you should be able to find out whether you can get parts, who will service the unit and what the warranty covers. A supplier who can’t give you straight answers is a red flag.
This guide sets out what to check, what to avoid and the red flags to watch for, using the terms and service information published on the DSA website. For help choosing the pump itself, read our guide to choosing a water-driven dosing pump.
Short answer: before you order, ask about parts, servicing, warranty, chemical compatibility, freight and payment. If you can’t get straight answers, treat that as a red flag.
Do ask whether you can get parts
On a water-driven dosing pump the parts that wear are the seals, pistons and injectors, and every one of them is replaceable. Ask whether seal kits and service kits are available for your exact model. DSA supplies genuine spare parts and service kits across the equipment it sells, including AquaBlend, Chemilizer, MixRite, Dosmatic, EvoClean laundry dispensers, the HydroFoamer and HydroSprayer and the By-Pass and Mobile Fertigation systems, backed by technical support.
Have the model number, a description of what the unit is doing and a photograph ready. For DSA, those three details are the fastest way to get the right part first time. See our spare parts page for what we supply.
Do ask who will service it
DSA offers a preventative maintenance service both in-house and on site, and trains customers to carry out preventative maintenance themselves. It states a 7 day turnaround for dispenser repairs and maintenance at its Western Sydney facility, which includes pressurised dispensing testing.
Ask any supplier the same questions: where is the work done, how long does it take, and is the unit tested under real water conditions before it comes back?
Do read the warranty before you order
The warranty says what is and is not covered, so read it first. Under the DSA terms of business:
- The warranty reflects the manufacturer’s warranty. Equipment is warranted free from defects in material and workmanship under normal use and service for one year from the date of manufacture.
- It does not apply to hoses, to wear components with a normal life shorter than one year, or to failure or damage caused by chemicals, abrasive materials, corrosion, lightning, improper voltage supply, physical abuse, mishandling or misapplication.
- It is extended only to the original buyer, and it is void if the product is altered or repaired without DSA’s prior written approval.
- Defective products can be returned only once DSA has approved the return, and goods returned are freight prepaid.
- Repair and service work carries a 90 day warranty on the specific work carried out.
- The warranty does not extend to liability for consequential damages caused by failure of products sold.
Do check chemical compatibility yourself
Damage caused by chemicals is excluded from the warranty, so chemical compatibility matters. DSA states that it is the responsibility of the purchaser to check that your chemical suits the materials in the pump, that its own advice is a suggestion because most chemical blends are proprietary, and that the equipment manufacturers do not warrant against chemical attack. Check the seals against your chemical and follow the chemical manufacturer’s label.
Don’t assume a worn pump needs replacing
Most faults on a water-driven pump trace back to a small number of parts, and the symptoms usually point to the cause:
| What you are seeing | Usual cause |
|---|---|
| Dose rate has drifted from the setting | Worn seals or a worn piston |
| Unit will not draw concentrate | Injector or check valve |
| Leaking from the body or joints | Seals and O-rings |
| Unit has stopped cycling | Piston assembly |
| Weak or watery foam on a foaming unit | Endcap screen or air intake |
| Chemical draw slows over time | Suction tube, strainer or injector partially blocked |
Most performance problems come down to worn seals, pistons or injectors rather than terminal failure, and a service kit is generally a fraction of the cost of a replacement unit. Rebuilding also keeps a known, calibrated unit in service rather than introducing a new one that has to be set up from scratch. Replacement usually makes sense when the body itself is damaged or the model is long superseded. DSA says it will tell you when a unit is beyond economical repair, rather than selling you parts for something that should be replaced.
Don’t leave freight and payment until last
Ask about freight and delivery to your location before you order. DSA invites you to contact the team for delivery and service coverage in your area. Under the DSA terms, all sales require full payment before dispatch, orders must be in document form by email or fax, and once an order has been processed internally it cannot be altered or cancelled. An account may be offered to approved customers on terms of 30 days from date of purchase, and payment can be made by EFT or Visa or Mastercard.
Red flags to watch for
Whoever you buy from, treat these as warning signs:
- A supplier who can’t say whether parts or service kits are available for the exact model you are buying.
- No clear answer on where servicing is done, how long it takes or whether the unit is tested before it comes back.
- Warranty terms you can’t read before you order, or terms that don’t say what is excluded.
- Anyone who says a pump will suit any chemical without asking what chemical you use.
- Being pushed to replace a unit without being told what has failed.
- Vagueness about freight, delivery or payment before you order.
What good looks like: a supplier that knows the product
A good supplier is easy to reach and can talk about your application. When you call DSA, you speak to someone who has worked with the product and understands the application. They can tell you whether the unit you are looking at suits your water pressure, flow rate and dose rate, and if it doesn’t, they will say so. We are a small team, four people with more than 30 years of combined chemical dispensing experience, and we want to be your trusted partner for metering and injection systems.
Our servicing runs through a purpose-built wet lab, commissioned in 2026 for preventative maintenance and repairs. A dosing pump is a hydraulic device. Bench testing shows whether the parts move, but not whether the unit holds an accurate dose under real water conditions. Every unit that comes through for service or repair is run under live water and performance checked before it goes back, so the dose is verified rather than assumed, and repairs are diagnosed and completed in house.
We also report on how your unit was performing when it arrived, so you can see what your water is doing to your equipment. If you have a medicator, proportioner or dosing pump that is not performing the way it used to, send it to us before you replace it. See our equipment servicing page for what the service covers.
Frequently asked questions
What should I check before buying a dosing pump?
Check whether parts and service kits are available for your exact model, who will service the unit and where, what the warranty excludes, and that your chemical suits the pump, which is the purchaser’s responsibility. Also ask about freight and payment before you order, and check the flow, pressure and dose rate against the model’s published ranges, as set out in our guide to choosing a water-driven dosing pump.
What are the red flags when buying a dosing pump?
Watch for a supplier who can’t say whether parts or service kits are available for your model, can’t tell you where servicing is done or how long it takes, or has warranty terms you can’t read before you order. Also watch for anyone who says a pump will suit any chemical without asking what yours is, who pushes replacement without explaining what has failed, or who is vague about freight and payment.
What does a dosing pump warranty cover?
Under the DSA terms of business, the warranty reflects the manufacturer’s warranty and covers defects in material and workmanship under normal use for one year from the date of manufacture. It does not apply to hoses, to wear components with a normal life shorter than one year, or to damage caused by chemicals, abrasive materials, corrosion, lightning, improper voltage supply, physical abuse, mishandling or misapplication. Repair and service work has a 90 day warranty on the specific work carried out.
How do I know when a dosing pump needs a service or new parts?
The symptom usually points to the cause. A dose rate that has drifted from the setting points to worn seals or a worn piston. A unit that will not draw concentrate points to the injector or check valve, and leaking from the body or joints points to seals and O-rings. A unit that has stopped cycling points to the piston assembly, and a chemical draw that slows over time points to a partly blocked suction tube, strainer or injector. Wear shifts the dose away from the setting, so a unit can appear to be working while dosing incorrectly.
Where can I get a dosing pump repaired?
DSA repairs and services water-driven dosing pumps at its Western Sydney facility, including AquaBlend, Chemilizer, Tefen MixRite and Dosmatic units, and states a 7 day turnaround for dispenser repairs and maintenance. Units are run under live water and performance checked before they are returned, and preventative maintenance is also offered on site.
Can I get spare parts for my dosing pump?
DSA supplies genuine spare parts and service kits across the equipment it sells, including AquaBlend, Chemilizer, Tefen MixRite, Dosmatic, EvoClean laundry dispensers, the HydroFoamer and HydroSprayer and the By-Pass and Mobile Fertigation systems. Send the model number, a description of what the unit is doing and a photograph. If you are running equipment DSA did not supply, it is still worth asking, as much of it shares common components.
Talk to us about parts, servicing or a quote
Send us the model number, the fault and a photograph and we will identify the parts you need, or tell us your application and we will discuss the right pump. See our spare parts and equipment servicing pages, or request a quote below.
This article is general guidance only. Always read the current DSA terms of business and the chemical product label, and confirm compatibility for your application.
