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The carbonate hardness is the stabilizer for the pH<\/a>. With low carbonate hardness the pH<\/a> is unstable, and can change rapidly again and again. The optimum for most aquariums and ponds is 4 – 8 \u00b0dKH.<\/p>\n To reduce the hardness, we recommend AQUAVITAL BLACK PEAT<\/a> or AQUAVITAL GRANU-PEAT<\/a>. To increase the hardness, place stone or gravel containing calcium (e. g. coral sand or marble stone) in the water. Products which contain carbonates, or dissoved baking soda, can also be added to the water to increase carbonate hardness.<\/p>\n <\/p>\n [\/et_pb_text][\/et_pb_column][\/et_pb_row][\/et_pb_section][et_pb_section bb_built=“1″ _builder_version=“3.12.2″ custom_padding=“0px|0px|60px|0px“ global_module=“53385″ prev_background_color=“#000000″][et_pb_row global_parent=“53385″ _builder_version=“3.0.47″ background_size=“initial“ background_position=“top_left“ background_repeat=“repeat“][et_pb_column type=“3_4″][et_pb_text global_parent=“53385″ _builder_version=“3.12.2″]<\/p>\n [\/et_pb_text][\/et_pb_column][et_pb_column type=“1_4″][et_pb_button global_parent=“53385″ button_url=“\/en\/contact“ button_text=“Contact“ _builder_version=“3.12.2″ custom_button=“on“ button_text_color=“#ff1919″ button_use_icon=“off“ box_shadow_style=“preset1″ box_shadow_color=“rgba(255,25,25,0.3)“ url_new_window=“on“ \/][\/et_pb_column][\/et_pb_row][\/et_pb_section]<\/p>\n","protected":false},"excerpt":{"rendered":" <div class=“et_pb_module et_pb_dmb_breadcrumbs_1 et_pb_dmb_breadcrumbs“ style=“visibility: hidden;“> <ol> <li><a href=“https:\/\/www.aquarium-munster.com“>Startseite<\/a><\/li> <\/ol> <\/div> Ask us what fish like about us!<\/h1>\n