COMPOSITION AND FUNCTIONING OF THE CIRCUIT 
The suite is mainly composed of the clock generation circuit and the decimal counting circuit. 
Self excited multivibrator is with NE555. Power that charges from capacitor C2 will go through R2 and R1, VR1. PIN2 of U1 is low low level C2 starts charging. Then the output terminal of PIN3 is high level low. And it returns to a low level when C2 has been charged with 2/3 of the supply voltage. Capacitor C2 begins discharge via PIN 7 of R1, VR1 and U1 when the inner cannula of U1. PIN3 change U1 from low to high when the voltage at each end of C2 is less than 1/3 of the supply voltage. And the C1 recharges. In this cycling, the oscillation is formed. 

Power Charging time: 0.695 (R2 + R1 + VR1) C2　 
Energy discharge time: 0.695 (VR1 + R1) C2 

Oscillator output frequency can be controlled by adjusting VR1. Clock U1 oscillation signal is applied to PIN14 of U2 constantly. And 10 output terminals of U2 are connected with ten LEDs. D1 - D10 are turned on alternately when 10 output terminals of U2 generate a high level under the effect of the clock signal. At last the light water is formed. 
* Adjust the flow rate of the LED lights by adjusting VR1