Having CRC Article net-limiting trace of 500ml, which does not prevent the cat to remake above or beside, and expensive, I 'd seen this product in 5 liters, but the price of 50 euros had repelled me , then one day I see appear at half price. I have bought dark and well received by the relay point. I pour into the empty net trace pitch, and I spray it feel anything. Sure to repeat 1 time every now and then as soon as the dreadful returns there. But to put more time again about 1 month. So good product with 5 liters and above all it is anything other than 500 ml. But the normal price 50 euros is too expensive. At 25 euros I'm all ears.