our heater is on the way out but a replacement is not in this year's budget. the unit is probably 15 years old with a metal housing and it appears some critters have gotten in there off season and love to chew on the wires. we had service done and were told that it would be quite expensive for rewiring and of course it's not worth it for such an old unit. the in ground pool is 20 x 40 and i know a new hayward heater is about 1500.00 plus installation. it's the way to go but not now. when the heater service guy left he said that we needed to backwash when the pressure got to about 30 which i knew already. with the heater on it's last legs, is the pressure related? it seems we are reaching higher pressure more often than in previous years and i'm having to backwash to relieve the pressure too often.
thanks in advance,