Water Testing Strips like the AquaChek Test Strips can be used to test for individual chemicals or you can buy something like AquaChek Select 7 Way Test Strips or Yellow 4 Way Chlorine to make multiple tests at the same time.
Most second-language speakers reside in Francophone Africa, in particular Gabon, Algeria, Mauritius, Senegal and Ivory Coast. In 2015, French was estimated to have 77 to 110 million native speakers, and 190 million secondary speakers. Approximately 274 million people are able to speak the language. According to a demographic projection led by the UniversitÃ© Laval and the RÃ©seau DÃ©mographie de l'Agence universitaire de la francophonie, total French speakers will number approximately 500 million people in 2025 and 650 million people by 2050.
English has the most speakers with approximately 2 billion speakers worldwide or 30% of the world's population. Most people mistake Mandarin for having the most speakers with â¦ 935,000,000 speakers, but Mandarin is the language with the most native speakers. English has the most speakers total. Only about 600,000,000 native speakers for English.