1.0GHL Advanced Technologyhttps://www.aquariumcomputer.com/de/rich600338<blockquote class="wp-embedded-content" data-secret="WrcY6bRbdM"><a href="https://www.aquariumcomputer.com/de/wpsp_canned_reply/khd-checklist/">KHD Checklist EN</a></blockquote><iframe sandbox="allow-scripts" security="restricted" src="https://www.aquariumcomputer.com/de/wpsp_canned_reply/khd-checklist/embed/#?secret=WrcY6bRbdM" width="600" height="338" title="„KHD Checklist EN“ – GHL Advanced Technology" data-secret="WrcY6bRbdM" frameborder="0" marginwidth="0" marginheight="0" scrolling="no" class="wp-embedded-content"></iframe><script> /*! This file is auto-generated */ !function(d,l){"use strict";l.querySelector&&d.addEventListener&&"undefined"!=typeof URL&&(d.wp=d.wp||{},d.wp.receiveEmbedMessage||(d.wp.receiveEmbedMessage=function(e){var t=e.data;if((t||t.secret||t.message||t.value)&&!/[^a-zA-Z0-9]/.test(t.secret)){for(var s,r,n,a=l.querySelectorAll('iframe[data-secret="'+t.secret+'"]'),o=l.querySelectorAll('blockquote[data-secret="'+t.secret+'"]'),c=new RegExp("^https?:$","i"),i=0;i<o.length;i++)o[i].style.display="none";for(i=0;i<a.length;i++)s=a[i],e.source===s.contentWindow&&(s.removeAttribute("style"),"height"===t.message?(1e3<(r=parseInt(t.value,10))?r=1e3:~~r<200&&(r=200),s.height=r):"link"===t.message&&(r=new URL(s.getAttribute("src")),n=new URL(t.value),c.test(n.protocol))&&n.host===r.host&&l.activeElement===s&&(d.top.location.href=t.value))}},d.addEventListener("message",d.wp.receiveEmbedMessage,!1),l.addEventListener("DOMContentLoaded",function(){for(var e,t,s=l.querySelectorAll("iframe.wp-embedded-content"),r=0;r<s.length;r++)(t=(e=s[r]).getAttribute("data-secret"))||(t=Math.random().toString(36).substring(2,12),e.src+="#?secret="+t,e.setAttribute("data-secret",t)),e.contentWindow.postMessage({message:"ready",secret:t},"*")},!1)))}(window,document); //# sourceURL=https://www.aquariumcomputer.com/wp-includes/js/wp-embed.min.js </script> Hello, A few points to check: -> Pump calibration is very important:Use a precision balance (2 decimal places).Calibrate with fresh water (except for the reagent pump, which can be calibrated with reagent, as its density is close to that of fresh water).Pour the pump into a container placed on the balance (1g = 1ml if using fresh water).Perform several calibrations in succession and check that the value is almost constant (choose the mean value). If the value varies greatly, it’s time to replace the dosing pump head (it’s a wearing part).Please note that the reagent pump head may need to be replaced if worn, despite stable flow, as it may no longer function correctly at very low speeds during titration.-> To determine the volume of the sample tube, fill the entire sample tube with fresh water and empty it onto the precision balance. This is more reliable than using the…