--- product_id: 118982649 title: "City Hydroponics Canna Calmag Agent Calcium Magnesium Additive 5L" brand: "city hydroponics" price: "€ 97.03" currency: EUR in_stock: false reviews_count: 1 url: https://www.desertcart.hr/products/118982649-city-hydroponics-canna-calmag-agent-calcium-magnesium-additive-5l store_origin: HR region: Croatia --- # City Hydroponics Canna Calmag Agent Calcium Magnesium Additive 5L **Brand:** city hydroponics **Price:** € 97.03 **Availability:** ❌ Out of Stock ## Quick Answers - **What is this?** City Hydroponics Canna Calmag Agent Calcium Magnesium Additive 5L by city hydroponics - **How much does it cost?** € 97.03 with free shipping - **Is it available?** Currently out of stock - **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/118982649-city-hydroponics-canna-calmag-agent-calcium-magnesium-additive-5l) ## Best For - city hydroponics enthusiasts ## Why This Product - Trusted city hydroponics brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Description Product description Calmag Agent is a calcium magnesium concentrate for buffering soft or reverse osmosis water. Calmag Agent is used to increase the EC of you water supply to 0.45 if your EC is 0.45 or higher it is not necessary to add Calmag. All CANNA nutrients are designed to work best with a water supply that has an EC of 0.4 - 0.7 water with 0.7 or higher contains high levels of sodium and chloride, these elements block uptake of nutrients and can be toxic to your plants, a reverse osmosis filter can remove these elements. When to use Calmag Agent? If youe water has an EC of 0.45 or lower use Calmag Agent to increase the EC to 0.45 before adding other nutrients and additives. Canna Calmag Agent usage: Shake well before using Use up to 1ml per litre of Calmag Agent Add to water before adding nutrients and additives Do not increase base water higher than EC 0.45 Legal Disclaimer SEE OUR FEEDBACK TO BUY WITH CONFIDENCE. EVERYTHING WE SEND OUT IS IN PLAIN PACKAGING..! For UK we accept PayPal, money orders, personal cheque, bank transfers or credit cards. Money orders, cheque or cash sent must include a reference or eBay username plus the item number, Postal orders and cash must be sent recorded delivery as we cannot take responsibility for lost money. Alternatively you are more than welcome to collect your order from our premises in cambridge and browse our shop which stocks over 1000 products. Delivery times: Please see our feedback for customer’s comments on speed of delivery. We carry a huge stock level and most courier orders placed before 4 pm are received the next day. For multiple items please click on ‘Request total from seller’ on the payment page. You will be charged the highest postage cost for 1 item then £1 for each additional item. You will not pay more than £10 delivery (ex. heavy items i.e. soils, lights etc.) Items less than 2kg in weight can be sent throughout the UK and N.Ireland at our standard postal rates by Royal Mail Items over 2kg are sent by courier where a delivery surcharge applies to: Highlands & Isle of Wight: Before 16:00 only £16 up to 20kgs in weight for post codes: AB37-38,41-45,51,56, FK19-21, IV1-28,30-37,40,54,63 KW1-3,5-14, PA21-40, PH15-26,30-41,49,50,TD, PO30-41 Scottish Offshore Islands: Two Day Only £20 up to 20kgs in weight for post codes: HS1-9, IV41-56, KA27-28, KW15-17, PA20,40-49,60-78, PH42-44, ZE1-3 Northern Ireland £25 up to 10kg in weight, £1.25 per kilo thereafter Republic of Ireland £35 up to 5 kilos in weight, £2.75 per kilo thereafter Offshore British mainland please message for a quote And if you are unsure about the weight of your order please message first for a quote ## Features - Canna Calmag Agent Calcium Magnesium Additive 5L ## Images ![City Hydroponics Canna Calmag Agent Calcium Magnesium Additive 5L - Image 1](https://m.media-amazon.com/images/I/61YyD7mB9aL.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ What's to say *by D***. on Reviewed in the United Kingdom on 5 June 2020* As ever --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.hr/products/118982649-city-hydroponics-canna-calmag-agent-calcium-magnesium-additive-5l](https://www.desertcart.hr/products/118982649-city-hydroponics-canna-calmag-agent-calcium-magnesium-additive-5l) --- *Product available on Desertcart Croatia* *Store origin: HR* *Last updated: 2026-07-11*