TDS, EC and Thermometer PEN
One of our favourite tools to use is a TDS pen. TDS = Total Dissolved Solids. It measures all the solid particles in the water and gives you a reading of part per million. We have no idea what the solid particles from the reading of a TDS pen are. It could be minerals, metals, salts and many more. When you feed your fish, the fish eat the food and eventually poop – but at the end of the day, the food/poop get broken down into small particles by your filter. These particles stay in the water. It has nowhere to go. This will result in a higher TDS reading as it reads everything in the water including the broken-down fish waste.
So why do we use a TDS pen? We use it because we hate doing weekly water changes! Want to know when to do a water change?
Measure the TDS of the water that you use to do water changes. Some people use tap water, borehole water or remonetized RO water. If the reading of this water is for an example on average 150ppm, we normally wait till the water in the tank has a TDS of between 50-70 higher than this reading. At this stage we will do a 30% – 50% water change. This helps us not to do unnecessary water changes.
A TDS pen can also tell you if the RO water that you use are in fact RO water. A proper RO water system will get your TDS to bellow 5ppm, but even 10ppm is acceptable.
TDS, EC & Thermometer PEN extended Features:
McMerwe’s Review: We use these TDS meters daily. They are fairly accurate and we have never found one that was malfunctioning. Its also valuable for an estimated EC. For the price, It’s well worth the buy for the TDS alone. (Review: 5/5)