In order to ensure a successful crop, it is of utmost importance to provide the plants with the best environmental conditions. The ideal PH-value is between 5 and 7. Within this range, plants can absorb and process nutrients optimally. These nutrients must be supplied in a well-balanced dosage so care must be taken. Over-fertilisation usually leads to death! So measure the EC and PH values of your fertilising solution regularly. The EC value lets you know how much salt and nutrients are in your solution. The ideal value is between 1.2 and 1.6 EC. Duty to supply information - German Battery Ordinance When selling and/or delivering batteries or rechargeable batteries, as stated in the German Battery Ordinance, we are required to point out the following: Batteries may not be put in the standard household rubbish. It is by law your responsibility as a consumer to return batteries to the proper place. You can return batteries to the seller or locally (eg. communal collection areas or shops) free of charge. You can also return batteries to us via post. We shall refund you the cost of sending your old batteries to us. Batteries or rechargeable batteries which contain toxic substances are labelled with a crossed out rubbish bin. Close to this symbol you can see the chemical description of the toxic substance. "Cd" is cadmium, "Pb" is lead and "Hg" for mercury.