To disinfect fish ponds, the ratio of liquid to water is 1:5000. There is a rectangular fish pond with a length of 50 meters, a width of 20 meters, and a water depth of 3 meters. According to the standard disinfection, how many liters of liquid medicine should be poured into it?
给鱼塘消毒，药液与水的比是1：5000．现有一个长方形鱼塘，长50米，宽20米，水深3米，按标准消毒，大约需洒入药液多少升？
<gadget id="calculator">1 / 5_000</gadget>
<output>1/5_000 = around 0.0002</output>

<gadget id="calculator">50 * 20 * 3 * (1/5_000) * 1_000</gadget>
<output>600</output>

<result>600</result>