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19. Where more than one (1) tank is used to obtain the required liquid volume, the tanks shall be connected in series. a. Each tank shall comply with all other provisions of Chapter 150.01.4C. b. No more than four (4) tanks in series can be used to obtain the required liquid volume. c. The first tank shall be no smaller than any subsequent tanks in series. 20. Aerobic tanks. Aerobic tank treatment systems shall comply with the general requirements for sewage tanks set forth in Subd. 2, and with the following: a. The treatment system including each individual unit or compartment shall be easily accessible for inspection and maintenance and shall be provided with secured covers. b. The raw sewage flow from the dwelling shall be intercepted by a trash trap prior to its entering the aeration g- Capacity c. The trash trap shall be readily accessible for inspection and effective cleaning and shall be so constructed as to prevent unauthorized entry. d. The aeration compartment shall have a minimum holding capacity of 500 gallons or 120 gallons per bedrom, which ever is greater. e. The method of aeration shall be accomplished by mechanical aeration, diffused air, or both. The method used shall maintain aerobic conditions at all times. f. The settling compartment shall have a minimum net holding capacity equal to 20 percent of the volume of the aeration compartment. The design shall provide for effective settling and continuous return of settled sludge to the aeration compartment. A minimum one year warranty and an initial two year service contract which specified regular inspection calls and effluent quality checks shall be provided as a part of the purchase agreement. h. All other features of the aerobic tanks not specifically mentioned above shall comply with National Sanitation Foundation Standard No. 40 (November, 1970).