There are three types of Qalqala

1. When the respective letters come in the middle of word, while having Sakoon is called Qalqala Sagheerah. Such as: ابتر
2. Second type of Qalqala is when these letters come in the end of word and we pronounce it with Sakoon while stopping on the last letter and this type of Qalqala is stronger than the first one, is called Qalqala Kabeerah. Such as: احد
3. Third type of Qalqala is the same as the second one but if there is Tashdeed on the last letter, this type of Qalqala is the strongest and more strong than the 2nd one, is called Qalqala Akbar. Such as: وتب