Selecting a drum filter is more difficult than it might seem. Most manufacturers only mention the maximum flow rate the drum filter is suited for. Oddly enough, most manufacturers don\u2019t mention at what level of contamination (mg suspended solids) this maximum flow rate applies to\u2026<\/p>\n
A drum filter designed for a lightly populated pond with a maximum water flow of 25m\u00b3\/hr will definitely not be able to handle 25m\u00b3\/hr in a heavily populated pond. That\u2019s why good filters mention the amount of pollution at which the maximum flow rate is achievable. The amount of pollution is given in milligrams of solid parts per litre of water. Ponds often use a value of 10 mg\/l and fish farms 25 mg\/l. However, fish farms use shorter flush intervals, the time between two flushes. It\u2019s not unusual for a drum filter to flush every 2~3 minutes, continuously flushing drum filters are even often seen in fish farms. A flush interval between 5 and 60 minutes is more common for ponds.<\/p>\n
A drum filter should not function on its maximum flow rate, at least that\u2019s the advice. For an example, let\u2019s say we\u2019ve got a flow rate of 25m\u00b3\/hr. If we can pick between two filters for this, one for 25m\u00b3\/hr and one for 50m\u00b3\/hr, the 50m\u00b3\/hr one would be the best choice. This filter would have to flush way less than its little brother (less than 50%!) and the filter will also filter finer*. The water and energy consumption are also way lower, the panels will take longer to get fat and the filter needs less maintenance.<\/p>\n
Too big of a drum filter also can\u2019t be recommended, this will filter too fine despite the panels with relatively big mesh size. We advise to pick a filter that\u2019s used to function on about 50% to 75% of its capacity. <\/p>\n
Drum filter can be equipped with filter panels with various mesh sizes. We recommend a mesh size between 70 and 100 micron. If you\u2019d filter any finer, the amount of flushes will increase and the biological filter<\/strong> won\u2019t work as well! A biological filter needs organic pollution to function well. There won\u2019t be enough organic pollution of the water\u2019s being filtered too fine and its performance will then decrease. <\/p>\n *Just because a drum filter has filter panels with a mesh size of 100 microns for example, doesn\u2019t mean it can filter (way) finer. This effect depends on the flush interval, the longer the flush interval, the finer the filter will filter. This is because the bigger particles will block the holes in the 100 micron mesh and smaller particles will then also be filtered out. <\/p>\n","protected":false},"excerpt":{"rendered":" Selecting a drum filter<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"open","ping_status":"open","template":"","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"class_list":["post-3969","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/tolwatertechniek.nl\/en\/wp-json\/wp\/v2\/pages\/3969","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/tolwatertechniek.nl\/en\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/tolwatertechniek.nl\/en\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/tolwatertechniek.nl\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/tolwatertechniek.nl\/en\/wp-json\/wp\/v2\/comments?post=3969"}],"version-history":[{"count":2,"href":"https:\/\/tolwatertechniek.nl\/en\/wp-json\/wp\/v2\/pages\/3969\/revisions"}],"predecessor-version":[{"id":7512,"href":"https:\/\/tolwatertechniek.nl\/en\/wp-json\/wp\/v2\/pages\/3969\/revisions\/7512"}],"wp:attachment":[{"href":"https:\/\/tolwatertechniek.nl\/en\/wp-json\/wp\/v2\/media?parent=3969"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}