Last month I had the septic tank pumped due to a backup in the house – also wet spot in the leech field – about two weeks after the pumping the septic tank began leaking from the lid and the leech field is dry – The company that pumped the tank said there was a great about of grease in the tank and said we may habe problems with the lines – the tank is approximately 8 years old, 1500-2000 gal, with washer and dishwasher connected – any comments would be appreciated. Thanks.