August 29, 2025
You’ve invested in high-quality deionised water for your business, but here’s something many people don’t realize – even the purest deionised water can lose its quality if it’s not handled properly.
After 20+ years of supplying deionised water across the UK, we’ve seen too many customers frustrated because their expensive ultra-pure water became contaminated through poor storage or handling.
The good news? With the right knowledge about how to test deionised water purity and proper deionised water storage tips, you can maintain that quality from delivery to final use.
Let’s walk through everything you need to know.
Here’s the thing – when people talk about “pure” water, they often don’t realize just how aggressive deionised water can be. Because we’ve stripped out all those dissolved minerals and ions, deionised water becomes incredibly good at dissolving things. It’s like nature abhors a vacuum – pure water wants to grab ions from whatever it touches.
If you’re running a laboratory, even tiny amounts of contamination can throw off your test results. We’ve had customers call us saying their experiments weren’t working, only to discover their deionised water had been sitting in the wrong container for weeks.
For electronics manufacturing, any mineral content can leave residues on sensitive components. One customer told us they had to scrap a whole batch of circuit boards because contaminated water left deposits during their cleaning process.
In automotive applications, particularly battery maintenance, impure water can actually damage battery cells and reduce performance. The whole point of using deionised water is defeated if it’s picked up contaminants along the way.
Let’s be honest – most people don’t test their deionised water regularly enough. Here’s how to do it properly without needing a chemistry degree.
TDS Meters – Your First Line of Defense A decent TDS (Total Dissolved Solids) meter costs about £15-30 and gives you instant results. Just dip it in your water and you’ll get a reading in parts per million (ppm). For most applications, you want to see less than 10 ppm.
Pro tip from our lab: Test from the middle of your container, not the surface. Surface water can pick up airborne contaminants that don’t represent the whole batch.
Conductivity Meters – The Professional Approach
If you’re serious about monitoring deionised water purity, a conductivity meter is your best friend. These measure how easily electricity flows through your water – the lower the number, the purer your water.
What to look for:
For critical applications like pharmaceutical manufacturing or precision electronics, you might need professional analysis. We work with several UK labs that can test for specific contaminants if you need detailed certificates.
This is where most people go wrong. You can buy the purest water in the world, but store it incorrectly and it’ll be contaminated within days.
HDPE (High-Density Polyethylene) – Usually Your Best Bet This is what we supply our water in, and there’s a good reason. HDPE doesn’t leach chemicals into the water and creates a good seal against contamination. It’s also tough enough to handle in busy workshops and labs.
Stainless Steel – When You Need Premium Storage For long-term storage or ultra-critical applications, pharmaceutical-grade stainless steel containers are worth the investment. They’re completely inert and can be properly sterilized.
Keep It Cool and Dark Heat and light accelerate contamination. We tell customers to treat deionised water storage like storing wine – cool, dark, stable conditions work best.
Seal It Properly Every time you open a container, you’re exposing your water to airborne contaminants. Use containers with tight-sealing lids and minimize opening frequency.
Away From Chemicals Don’t store deionised water near cleaning chemicals, solvents, or anything that gives off vapors. Deionised water can absorb these contaminants from the air.
Here’s a question we get almost daily: “How long does deionised water stay pure?”
The honest answer? It depends entirely on how you store it.
Conductivity Rising: If your meter readings start climbing above your usual range, it’s time for fresh water.
Visual Changes: Any cloudiness, particles, or color change means contamination has occurred.
Smell Test: Pure deionised water should be completely odorless. Any smell indicates bacterial growth or chemical contamination.
Performance Issues: If your equipment starts showing problems or your test results become inconsistent, suspect your water quality first.
Different industries have different tolerance levels and requirements. Here’s what we’ve learned from our customers:
Labs can’t mess around with water quality. Here’s what works:
Real example: A pharmaceutical lab in Surrey told us they now test water quality every morning after a batch of samples was ruined by contaminated water. Simple daily testing saved them thousands in wasted work.
Battery applications are more forgiving, but contamination still matters:
Electronic component cleaning requires consistently pure water:
Steam cleaners need pure water to prevent scale buildup:
After two decades in this business, we’ve seen every mistake in the book. Here are the most common ones:
Mixing Old and New Water Never top up old containers with fresh water. Contamination spreads quickly through the entire volume.
Using the Wrong Container
That empty chemical container might look perfect, but chemical residues will contaminate your pure water instantly.
Ignoring Temperature Changes Storing water where temperatures fluctuate causes condensation inside containers, which introduces contamination.
Forgetting About Air Space Large containers with lots of air space expose more water surface to potential airborne contamination.
For routine monitoring, a simple conductivity meter tells you everything you need to know. We recommend testing:
Consider professional testing when:
We can recommend several UK labs that specialize in water analysis if you need professional testing services.
✅ Storage Checklist:
✅ Testing Schedule:
✅ Handling Protocol:
✅ When to Replace:
The best way to ensure deionised water purity? Start with the highest quality water and receive it in properly sealed containers designed for purity preservation.
Every batch of our deionised water undergoes rigorous quality testing before dispatch. Our 25L containers are specifically designed to maintain purity during transport and storage, while our 1000L IBC containers feature specialized sealing systems for larger operations.
📞 Call: [Phone Number] – Speak to water purity experts
🌐 Online: [Website] – Secure ordering with delivery tracking
📧 Email: [Email] – Technical questions welcomed
Don’t let poor storage ruin good water. Order fresh, properly packaged deionised water from the UK’s most trusted supplier.
About The Deionised Water Company: We’ve been manufacturing and supplying high-quality deionised water across the UK for over 20 years. Our commitment to purity starts with production and continues through packaging, delivery, and customer support. When UK businesses need to buy deionised water online, they choose us for consistent quality and expert service.
Suffolk IP27 0XA
