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Calzestab Eisenex - 1l

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Liquid preparation preventing precipitation of lime and other minerals contained in pool water. It prevents the reaction of these minerals with added pool chemicals, reducing the consumption of pool chemicals in hard water.

Water hardness is most commonly caused by the amount of dissolved lime and magnesium. In most waters, these elements completely dominate, so we can disregard the others and it doesn't really matter. Water hardness is mainly due to calcium (the Ca:Mg ratio in most natural waters is 2:1 to 4:1). In nature, we find water both very soft and very hard - it depends on the minerals the water comes into contact with. Tap water is rarely very soft, it is mostly moderately to very hard. The harder the pool water, the more scale deposits on the pool walls. For a pool, it is optimal to maintain water hardness at a moderately hard value. It is important to note that evaporation of water from the pool makes the water harder. Water hardness is measured using testers labeled "total hardness test."

The results (in German degrees of hardness and in ppm CaCO3) are interpreted as follows:

0-4 dGH/0-70 ppm ... very soft water
4-8 dGH/70-140 ppm ... soft water
8-12 dGH/140-210 ppm ... moderately hard (semi-hard) water
12-18 dGH/210-320 ppm ... hard water
18-30 dGH/320-530 ppm ... very hard water

When treating a pool and adjusting the water, specific problems can arise. For these special cases, we have developed special products that will help solve these problems quickly and effectively, reducing fluctuations in pool water quality during routine pool maintenance. These preparations include, for example, Calzestab Eisenex and Metal Magic.


This product has 12 month warranty. In the event of a product breakdown within the warranty period, you should contact us as soon as possible.

The Buyer has the right to make his defective goods claim within 12 months of accepting the goods. If a defect manifests itself within six months of the Buyer accepting the goods, such goods are presumed to be defective at acceptance unless the Seller proves otherwise.


Should you require any further information, please email where we will respond to your request quickly.

More information Terms and conditions


This product is in stock at our warehouse and is ready for Standard or Express delivery Service.

Delivery – Mainland UK

Delivery Times: - Standard delivery: 1-2 weeks

Most of our products, when ordered by 12 PM  Monday to Friday, will be dispatched for next-day delivery . In cases where items are not in stock or are special orders, delivery times may be longer.

Rest assured, we will contact you beforehand to provide an estimated delivery date.

If you have specific delivery instructions, such as gifting or a required delivery date, please include them in your order.

 If your billing address is different from the delivery address, you can provide the latter separately in the order form. We will accommodate the delivery address if possible under contractual conditions.

Please note that some areas of Scotland, Northern Ireland, the Isle of Man, and the Isle of Wight may incur extra carriage charges.

Please check your delivery

If you sign for a delivery as "OK" and later discover that it's damaged, our carriers will not accept liability, and you may be charged for the damaged items. In such cases, we will make a delivery charge for replacement items.

Please sign for your delivery as "UNCHECKED" if you're unable to thoroughly check it upon receipt. If there is any damage to the package, no matter how small, please sign for it as "DAMAGED". We cannot make claims for any damaged items that haven't been signed for as "UNCHECKED" or "DAMAGED".

If you sign for your goods as "DAMAGED", please notify us within 72 hours by email at

More information Terms and conditions

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