Yes mine is small 154BH SLX. Dumping anti freeze may be an idea
what about the following :
1. before the temp drop every night, drop a half bottle of anti freeze each on both grey and black tank. Let it mix with existing water
2. In the afternoon after temp rise above freezing dump both tank
Questions I have :
1. Does mixing half bottle and 5 to 8 gallons of water in black tank, or grey tank enough to prevent the tank to freeze over night ??
Originally Posted by norty1
Can we assume that you own some model of SLX? If so your options may be limited other than what has been mentioned if your tanks are not enclosed.