i have a pro sprayer i use it to spray hypo 1 to 4 then after use flush with water i have had it for 12 months no problems apart from if i dont flush with water it will block with salt deposits badly and it wont work so i have to take of the pipe then put the hole under the running garden tap and switch sprayer on but thats operator error has anyone had issues with them i know there no good for soft washing cant get the reach and height but ideal for what i do floor spraying do i need to worry about the seals or motor going running 1 to 4 mix