Water Level Indicator With Arduino And LCD

#include <LiquidCrystal.h>
#define level_1 A0
#define level_2 A1
#define level_3 A2
int a = 0;
int b = 0;
int c = 0;
/*
   LCD in 4-Bit-Modus:
       LCD RS pin an digital pin 8
       LCD RW pin an digital pin 13
       LCD Enable pin an digital pin 9
       LCD D4 pin an digital pin 4
       LCD D5 pin an digital pin 5
       LCD D6 pin an digital pin 6
       LCD D7 pin an digital pin 7
*/

// Setup LCD-Shield
LiquidCrystal lcd(8, 13, 9, 4, 5, 6, 7);

void setup() {
  pinMode(level_1, INPUT);
  pinMode(level_2, INPUT);
  pinMode(level_3, INPUT);
  Serial.begin(9600);
  // Display initialisieren
  lcd.clear();
  lcd.begin(16, 2); // 16x2 Zeichen
  lcd.setCursor(0, 0);
  lcd.print("LightMeter v1.0");
  lcd.setCursor(0, 1);
  lcd.print("Initializing...");
  delay(1000);
  lcd.clear();

}

void loop() {
  a = analogRead(level_1);
  b = analogRead(level_2);
  c = analogRead(level_3);
  //Serial.print(a);
  //Serial.print(b);
  // Serial.println(c);
  if (a < 990 && b > 990 && c > 990) {
    Serial.println("Water Level @ 33%");
    lcd.setCursor(0, 0);
    lcd.print("Water Level at:");
    lcd.setCursor(0, 1);
    lcd.print("  33%   ");
  }
  else if (a < 990 && b < 990 && c > 990) {
    Serial.println("Water Level @ 66%");
    lcd.setCursor(0, 0);
    lcd.print("Water Level at:");
    lcd.setCursor(0, 1);
    lcd.print("  66%   ");
  }
  else if (a < 990 && b < 990 && c < 990) {
    Serial.println("Water Level @ 100%");
    lcd.setCursor(0, 0);
    lcd.print("Water Level at:");
    lcd.setCursor(0, 1);
    lcd.print("  100%  ");
  }
  else {
    Serial.println("Water Level @ 0%");
    lcd.setCursor(0, 0);
    lcd.print("Water Level at:");
    lcd.setCursor(0, 1);
    lcd.print("  0%   ");
  }

  delay(500);
}